Certain sites have periods when the drop down menus don't work. It's random. Example: northshorebreakingnews.com now doesn't work (it's on the Woo Canvas theme). We have a number of the same sites on an MU platform. The sites that were built before June 2011 have no problem, like breakingsfnews.com
There are no plugin conflicts, because we don't run plugins. The one strange thing that happens is *sometimes* but not all the time, if we activate the runphp plugin, it fixes the problem for a while but then reverts back to not working.
Any fix for this?