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When I went to sleepast night it was fine. Woke up to this:

Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/plugins/accountswitcher.php	34	DB_MySQLi->escape_string
/inc/class_plugins.php	43	require_once
/inc/init.php	204	pluginSystem->load
/global.php	19	require_once
/index.php	18	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	36	DB_MySQLi->escape_string
/global.php	55	session->init
/index.php	18	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	38	DB_MySQLi->escape_string
/global.php	55	session->init
/index.php	18	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	502	DB_MySQLi->escape_string
/inc/class_session.php	290	session->create_session
/inc/class_session.php	50	session->load_user
/global.php	55	session->init
/index.php	18	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	503	DB_MySQLi->escape_string
/inc/class_session.php	290	session->create_session
/inc/class_session.php	50	session->load_user
/global.php	55	session->init
/index.php	18	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	509	DB_MySQLi->escape_string
/inc/class_session.php	290	session->create_session
/inc/class_session.php	50	session->load_user
/global.php	55	session->init
/index.php	18	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)

Any ideas?

When trying to logon to admin, I get this:

Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/plugins/google_seo/url.php	1037	DB_MySQLi->escape_string
/inc/plugins/google_seo/url.php	1108	google_seo_url_id
/inc/plugins/google_seo/url.php	173	google_seo_url_hook
/inc/plugins/google_seo.php	311	require_once
/inc/class_plugins.php	43	require_once
/inc/init.php	204	pluginSystem->load
/global.php	19	require_once
/forumdisplay.php	21	require_once
Warning [2] preg_replace(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 239 - File: inc/plugins/google_seo/url.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/plugins/google_seo/url.php	239	preg_replace
/inc/plugins/google_seo/url.php	434	google_seo_url_separate
/inc/plugins/google_seo/url.php	1120	google_seo_url_create
/inc/plugins/google_seo/url.php	173	google_seo_url_hook
/inc/plugins/google_seo.php	311	require_once
/inc/class_plugins.php	43	require_once
/inc/init.php	204	pluginSystem->load
/global.php	19	require_once
/forumdisplay.php	21	require_once
Warning [2] preg_replace(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 244 - File: inc/plugins/google_seo/url.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/plugins/google_seo/url.php	244	preg_replace
/inc/plugins/google_seo/url.php	434	google_seo_url_separate
/inc/plugins/google_seo/url.php	1120	google_seo_url_create
/inc/plugins/google_seo/url.php	173	google_seo_url_hook
/inc/plugins/google_seo.php	311	require_once
/inc/class_plugins.php	43	require_once
/inc/init.php	204	pluginSystem->load
/global.php	19	require_once
/forumdisplay.php	21	require_once
Warning [2] preg_replace(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 249 - File: inc/plugins/google_seo/url.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/plugins/google_seo/url.php	249	preg_replace
/inc/plugins/google_seo/url.php	434	google_seo_url_separate
/inc/plugins/google_seo/url.php	1120	google_seo_url_create
/inc/plugins/google_seo/url.php	173	google_seo_url_hook
/inc/plugins/google_seo.php	311	require_once
/inc/class_plugins.php	43	require_once
/inc/init.php	204	pluginSystem->load
/global.php	19	require_once
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/plugins/google_seo/url.php	474	DB_MySQLi->escape_string
/inc/plugins/google_seo/url.php	1120	google_seo_url_create
/inc/plugins/google_seo/url.php	173	google_seo_url_hook
/inc/plugins/google_seo.php	311	require_once
/inc/class_plugins.php	43	require_once
/inc/init.php	204	pluginSystem->load
/global.php	19	require_once
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/plugins/google_seo/url.php	475	DB_MySQLi->escape_string
/inc/plugins/google_seo/url.php	1120	google_seo_url_create
/inc/plugins/google_seo/url.php	173	google_seo_url_hook
/inc/plugins/google_seo.php	311	require_once
/inc/class_plugins.php	43	require_once
/inc/init.php	204	pluginSystem->load
/global.php	19	require_once
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/plugins/accountswitcher.php	34	DB_MySQLi->escape_string
/inc/class_plugins.php	43	require_once
/inc/init.php	204	pluginSystem->load
/global.php	19	require_once
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	36	DB_MySQLi->escape_string
/global.php	55	session->init
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	38	DB_MySQLi->escape_string
/global.php	55	session->init
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	164	DB_MySQLi->escape_string
/inc/class_session.php	50	session->load_user
/global.php	55	session->init
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	502	DB_MySQLi->escape_string
/inc/class_session.php	290	session->create_session
/inc/class_session.php	50	session->load_user
/global.php	55	session->init
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	503	DB_MySQLi->escape_string
/inc/class_session.php	290	session->create_session
/inc/class_session.php	50	session->load_user
/global.php	55	session->init
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_session.php	509	DB_MySQLi->escape_string
/inc/class_session.php	290	session->create_session
/inc/class_session.php	50	session->load_user
/global.php	55	session->init
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_templates.php	83	DB_MySQLi->escape_string
/inc/plugins/phptpl.php(75) : eval()'d code	15	templates->get
/inc/plugins/highslide.php	202	phptpl_templates->get
/inc/class_plugins.php	101	highslide_fetchtemplate
/global.php	101	pluginSystem->run_hooks
/forumdisplay.php	21	require_once
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/global.php	318	DB_MySQLi->escape_string
/forumdisplay.php	21	require_once
Warning [2] preg_replace(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 78 - File: inc/plugins/google_seo/meta.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/plugins/google_seo/meta.php	78	preg_replace
/inc/plugins/google_seo/meta.php	183	google_seo_meta_description
/inc/class_plugins.php	101	google_seo_meta_forum
/forumdisplay.php	1346	pluginSystem->run_hooks
Warning [2] preg_replace(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 79 - File: inc/plugins/google_seo/meta.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/plugins/google_seo/meta.php	79	preg_replace
/inc/plugins/google_seo/meta.php	183	google_seo_meta_description
/inc/class_plugins.php	101	google_seo_meta_forum
/forumdisplay.php	1346	pluginSystem->run_hooks
Warning [2] preg_match(): Compilation failed: unknown option bit(s) set at offset 0 - Line: 6660 - File: inc/functions.php PHP 5.4.35 (Linux)
File	Line	Function
[PHP]	 	errorHandler->error
/inc/functions.php	6660	preg_match
/inc/db_mysqli.php	876	validate_utf8_string
/inc/class_templates.php	83	DB_MySQLi->escape_string
/inc/plugins/phptpl.php(75) : eval()'d code	15	templates->get
/inc/class_error.php	287	phptpl_templates->get
/inc/functions.php	314	errorHandler->show_warnings
/inc/functions.php	22	parse_page
/forumdisplay.php	1351	output_page

Any ideas?

It;s to do with your Google SEO plugin.

Go into the .htaccess file and delete the rewrites you put in there from the plugin.

I have made absolutely no changes. Went to sleep at 2am and it was fine. Woke up about an hour ago and it's like this.

You're sure it's the SEO Plugin? Logging in to Admin has no errors regarding Google SEO.

Yes, it happened to me , a similar problem.

Well... I tried to change the .htaccess, but it didn't do any good.

How do I revert the core files? I can't access admin to disable the plugin. And why would this have happened if I didn't make any changes?

^ if you can wait for a couple of hours,
would you like to PM me temporary access to admin panel (though its not loading for you) & files (ftp) to check referred issues

Hi .m.

Thanks for your offer of support. The site is now completely down. Possibly due to techs "working on it"

I have sent you a PM with FTP and cPanel logon

---

Thanks to .m. for his offer of help. He took care of at least one error. The main problem was that Namecheap had made changes to PHP 5.4 on the server. Switching to 5.3 instantly took care of the problem. Now they've reverted 5.4 and the problem seems fixed. Thanks again to .m. Much appreciated someone stepping up and offering the help like this. Also to Saint Francis for his replies. Regards.