This happened last night on our TK raid. When I would release, I would be out at the GY and only have 2 party member frames -- a druid and a warrior. I checked and unchecked the "Show party in raid" and "Show 5-man raid as party" (or similar wording... I can't look it up right now because I'm at work. :))... but they would still not show. I kept having to /reloadui to get all the frames to come back.
All of my Ace addons are up-to-date -- I use the aceupdater program to do this any time I run into an error, to make sure there wasn't a fix already. I am currently using Grid as well, for my raid frames.
Has anyone else had this problem? I'm just getting tired of reloading my UI all the time. :(
Party frames are at top left corner and after every zoning two party members may disappear. Whether disabling/enabling nor going into configmode does help. I have to /reloadui to get them displayed again.
After having some raids without this problem it happened again today.
So I decided to do some testing to isolate possible troublemaker-addons or even find a way to reproduce this bug.
And now I am pretty sure, it's a problem with Pitbull and oRA2. With a clean addon directory and only Pitbull and oRA2 installed, party frames kept disappearing on zoning. After disabling oRA2, everything was fine again.
Further testing showed, that this only happens when MTs are set. If one MT is in your party, his partyframe does not disappear.
Even with visible partyframes (after reloadui or relog) you can see that there is a problem, because in raid-configmode some maintanks and maintanktargets are not visible (I don't know about maintanktargetstargets because I don't use them).
I did all this testing only with three people in the raid, me being the only one online (I couldn't find volunteers for some hours of testing). It doesn't matter how many MTs are displayed with oRA2 (I have set it to 0 usually) or which addon is loaded first (checked with warmup).
Just before posting this, I found out that disabling maintanks and maintanktargets is a way to avoid the bug.
I hope this helps the devs to fix the bug. In case you have problems to reproduce the problem, I'll attach my settings (1024x768 and ui-scale 0.85).
Anyway I want to thank you for your work, I hardly could play without Pitbull now.
Yeah, I'm having this exact same problem too. Whenever I die or zone in while in a raid group, my raid frames will randomly disappear, or only have select players showing. All my addons are updated too, and I use the WowAceUpdater.