Lately I have noticed that PVP has been disabled on the creative server (I just a few weeks back but I may have outdated information). Is there a reason PVP has been disabled or is it just an error?

PvP was disabled automatically when we first updated to the "real" version of 1.7, but it was enabled again a short time after that. Edit: My bad, it was still disabled. Thanks for bringing it to our attention.