Right click on the webpage select inspect
element. Then select console. Check if gives
any error which says jQuery is missing. In my case
jQuery files were missing in WordPress migration which I
had to add myself.
-1 down
vote
It's a jQuery problem. I solved it by adding: define('CONCATENATE_SCRIPTS',
false); to the wp-config.php
file, just below the define('DB_HOST')
line.
http://codex.wordpress.org/Editing_wp-config.php#Disable_Javascript_Concatenation
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While this solution
may alleviate the symptom, the underlying
conflicts/errors are likely still present.
– bosco
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