On my site www.fotocomefare.com I've been using the same menu for months.
It is a Wordpress menu I assigned to the %cats menu. In it, I recreated the category structure.
It used to work, that is, when you hovered over a category name, sub categories would drop down.
Today I discovered it doesn't work anymore. Down arrows are shown and hovering changes the items background color. However no subcategory list drops down.

I tried W3 Total Cache, supposing js minification was the culprit, but it isn't so.
I turned off Animate Category Menu Bar but it didn't change anything.

I'm using Wordpress 3.3.1 and atahualpa 3.6.4. What can I do?

Have you recently added any plugins?
Have you tried deactivating all your plugins as a test?

Yes, I added and remove some. Usually I try not to try such disruptive solutions.
However, I will try it tomorrow, since I already have to disable them to solve some performance problem.

this is why it is wise to have a test site you can play with. you might be able to dreate a subdomain for this - let's say your site is myxyx.com - you could create playsite.myxys.com with it's own database and files.

just a thought

Originally Posted by ragdoll

Yes, I added and remove some. Usually I try not to try such disruptive solutions.
However, I will try it tomorrow, since I already have to disable them to solve some performance problem.

What I am talking about is just temporarily deactivating all of them to see if it is a plugin conflict. I usually just select them all, deactivate, see if the problem is there, and then if the site is live I go to the recently active plugins tab and reactivate. If I have some time to play and deactivating all of the plugins fixed the problem I start reactivating them a few at time to figure out which one is the culprit.

Well, I deactivated my plugins and nothing changes. Menus still do not drop down.

please disable w3 total cache and clear the caches

Originally Posted by juggledad

please disable w3 total cache and clear the caches

Yesterday I disabled all plugins, including w3tc and nothing changed. The drop own menus use javascript, don't they?

Remove everything you have in the CSS Inserts (copy it to a text file) and see what happens

Originally Posted by juggledad

Remove everything you have in the CSS Inserts (copy it to a text file) and see what happens

Thank you, didn't think about that, but it worked. I added ul{overflow:hidden;} to correct the lack of indentation in lists next to floated items and it conflicted with the drop down.
Can you explain me the reason for this conflict?

Can you explain me the reason for this conflict?

not really

Originally Posted by juggledad

not really

Thank you anyway.