There's no error messages, nothing appears out of the ordinary. Except when I'm in combat, Pitbull will not draw new frames until I exit combat. This includes the target frame, party frames, target of target, etc. No new frames are drawn until combat is over. At the moment I do not get a target window (for a raid boss, for example) if I do not have SOMETHING targeted prior to being put into combat. It doesn't matter if the target is friendly or hostile, so long as the frame is already drawn when I'm put into combat.
The same is true for Bongos2. If I summon my pet mid-fight, he will not have a pet bar. If he was out beforehand, there's no issue. I disabled everything BUT Pitbull and Bongos2, and they worked fine for 20 minutes of farming straight. I turned on everything BUT Prat and they were fine for another 20 minutes straight. I turned Prat on by itself (no modules, LoD, etc.), and the problems returned immediately.
So obviously, there's something amiss. There's no error messages to speak of. It's completely transparent, aside from the fact that you'll suddenly find yourself lacking UI/bar frames.
I should also note that there are others in my own guild who are running Pitbull or AGUF with Prat flawlessly. They recommended deleting the folders under /Interface/Addons/, downloading directly off the SVN rather than through the updater, and trying again. I did all of these things, and the problem is still present. I'm using the latest version currently available. (r36746)
I'm sorry if that doesn't help, but it's all I've experienced.
If you have a target, any target even yourself when you go into combat its fine. Its if you try to target something in combat without any previous target. I'm guessing something is tainted and is stopping the new frame from being created.
At least that's my take on the situation, its not totally broken but its a pain.
user Spyte reports that reverting to Prat version 36378 plus bongos 1.2c has fixed his issues. i'll try this later and report back my findings.
Thanks for pinpointing the conflict Speak!
As you said, I never in a million years would've thought to disable Prat as the conflicting AddOn.
I don't use PitBull, but I can confirm that the latest Prat does prevent page swapping while in combat for Bongos 1.1, 1.2, and 1.2c. I reverted to a version of Prat from 2 days ago (v. 36378) and now both Prat and Bongos 1.2c are playing nicely together.
(As an aside to those with a lot of Ace AddOns, I also started getting error messages from CooldownTimers2 this morning - reverting to a version from 2 days ago also resolved that).