Huh, weird. I've seen some discussion about the bubbles and instances on the Wowinterface forums. I guess I have been lucky with Prat and TidyPlates because I do not suffer the problems. Not sure what to tell you guys, and suddenly I am no help. :-(
I get zero errors with Prat, not even with chat bubbles. And while I am not the author of Prat, I am curious what kind of errors people are getting. If you could copy/past a bug report from BugSack/Swatter/Bugger/RealUI_Errors that would be fantastic.
Ah, I see a further wrinkle or two. Since the conversion to the new Wowace from the old Wowace, the Prat authors have not enabled the Issues tracker; the link in the description points to the old, dead, tracker.
Also, the forums link provided goes to the old Wowace forums as well, which are locked and closed. I guess this forum is the only way to get a hold of the authors, unless you use IRC.