Validation check on Contact Us page?

[Matt]

Edit your ./inc/config.php and change the value for $config['database']['type'] to mysqli, it's probably set to mysql currently.

Thanks, you were right. I changed it.

And I set it back to PHP 7.4.22 again.

Now I see this on both my main site, and the admin console:

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MyBB Internal: One or more warnings occurred. Please contact your administrator for assistance.

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I can't find where the warnings are logged.

Also read the following:
https://docs.mybb.com/1.8/faq/errors/

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I'm noticing a few more issues, after the PHP 7.4 upgrade.

1) Posts made via the quick editor appear to hang. But if I open another tab and go to the main page, I see the posts have been submitted.

2) The thread titles remain bold, indicating that I haven't read all the posts in that thread. But I know I have, and I've clicked on those threads repeatedly. They don't go away, they still stay bold.

EDIT: I temporarily switched it back to 5.6. No issues with the above, anymore.

Nor any warnings shown on the main forum page.

The errors you described shouldn't have anything to do with PHP version - the first one is javascript so not PHP, and threads being read wouldn't change with PHP version. We've been running 7.4 on the community forums for a good year and a half, and haven't had these issues reported by other users. It's likely out of date plugins if anything causing errors. PHP 7.0 is also unsupported, the oldest version you should be using is 7.3.