My party frames randomly disappear sometimes after zoning (possibly only when I'm in a raid, not sure about that). I always have the most current version (atm 45121) and I don't have the "hide party frames in raids" option active.
Is this a known problem and should I report it as a bug somewhere?
I had the same problem when using the MT-frames of Pitbull and MTs are set. It does not matter if they are set using oRA2, CT-Raid or Blizzard UI.
After disabling the MT-frames in Pitbull and using oRA2 for that it never happened again.
The problem also is descibed in http://www.wowace.com/forums/index.php?topic=6963.0