Hello,
Method-1
Disable all plugins and check it. If not success sign out again. If success, the reason is plugins conflicting. Enable one by one and detect the plugin and try to update it.
Method-2
If you installed cache plugins clear all cache with admin panel. If you minified javascript, disable and check with reloading page.
Method-3
Apply default theme and check. If success, the reason is in your current theme. Try to update or find the solutions with theme owners/developers.
Method-4
If you are not install firebug add-on, Install to the browser and press F12 key, click Console button and check if displaying JavaScript or some errors.
If displaying you can identify what the errors.
Method-5
Check the jQuery library file is loaded into the admin panel. If not exist, add it.
Better way is add “Use Google Libraries” Plugin. Then lot of issues are fixing.
Download Use Google Libraries from here.
Method-6
1-Go to the root folder and open wp-config.php file.
2-Copy and paste the following script end of the file and save it.
define('SCRIPT_DEBUG', true);
3-Check the admin panel for issues.
Hope this will be help to solve these issues!
Thanks,
Group of Oceninfo