There are a couple of reasons why your Thesis Admin Menus are not working properly, and both have to do with JavaScript issues. Explore the potential solutions below.
Disabled Concatenation of Scripts
The most common cause of this issue is jQuery scripts being called out of order, which typically results from having configured your WordPress installation to disable its default concatenation of scripts.
To verify whether this is indeed the case (and if so, correct it), do the following:
Log into your server via FTP and open your wp-config.php file for editing; then search for the following line of code:
define('CONCATENATE_SCRIPTS', false);
If this line is present in the file, then add two slashes at the beginning of it to comment it out:
//define('CONCATENATE_SCRIPTS', false);
then save the wp-config.php file back to your server.
Once that’s done, go back to the Thesis Admin screen, do a hard refresh in your browser (use CTRL-R on Windows, CMD-R on Mac), then verify the menus are now working correctly.
Plugin Conflicts
Certain plugins can also introduce jQuery conflicts which interfere with the proper functioning of the Thesis Admin Menus; so try deactivating all of your plugins to see if doing so resolves the problem.
If it does, then re-activate your plugins one at a time, checking in between each one to see whether the Thesis Admin Menus continue to work or not—this should allow you to identify which specific plugin is responsible for the conflict (and thus, needs to remain deactivated in order for the Menus to function properly).