Ok, this thing wont let me edit my last post…anyway, I said that the thing screwing with my autocomplete was the “Buddypress Sitewide activity widget” plugin….but what I didn’t said is that actually is the Buddypress Sitewide activity widget V 1.1.3 was the problem!….I installed the lastest version (1.1.3.1) and the autocomplete works great!
I had the same problem….the autocomplete not working was driving me crazy….really….and after lots of days (and eternal nights) of suffer and horror I found the problem!!! !!
So in my case the cause was a plugin called “Buddypress Sitewide activity widget”…..why?, I don’t really know yet…..but this for all those who need an alternative answer for their autocomplete problems !