I first started using the devbridge autocomplete since it look pretty good and then I needed a tagging plugin called tagedit.
What I found was that tagedit was using jquery-ui autocomplete and it would not work at all when devbridgeautocomplete was called above.
I tried to alias it like other people said but it didn’t help.
So in the end I removed devbridge autocomplete and used jquery-ui autocomplete
Hope it helps