Problem with dropdown menus after upgrading to 3.7.7

[محروم.كوم]

Wondering if anyone else has experienced this problem.

After upgrading to 3.7.7 the dropdown menus are now behaving in a very strange way, for a start the first time you access any dropdown menu you have to click twice before it will drop down, and then all the dropdwon menus work with one click.

On any "multipage" page e.g. a thread with over 40 posts or a profile with more than one page of visitor comments dropdown menus just don't work.

Done all the usual stuff, gone back to a default style, switched off plug-ins (via edit to config.php), re-uploaded the files and the problem persists.

Any ideas? (I have rasied a support ticket but they are busy at the moment so thought I'd see if anyone had any ideas here while I am waiting.) __DEFINE_LIKE_SHARE__