MyBB Community Forums

Ive discovered the solution and i would like to share with you dudes:

i dont know exacty the reason but in any plugin with this line:

$plugins->add_hook("pre_output_page", "phpfreechat_header");

the bug will hapens so there is no need to unistall or remove the plugin the solution is far simpler, you must just comment that line of code (or remove it)