Tab Mix Plus artefacts in Firefox 3.5

Unfortunately I've come across something that doesn't seem to be playing well with Mozilla Firefox 3.5: Tab Mix Plus. Despite working flawlessly in the betas and release candidates, my tabs since going to the final release have been displaying weird artefacts or are simply not drawn properly.

I'll wait to see if I can reproduce it predictably, then file a bug report or post a message on their forums. I'm running version 0.7.2009062901 which as far as I know is the most current one.