Tom, you seem to be using a different version of vBulletin so I really wouldn't sweat it. Jim's has had a lot of problems the past few months, pictures not loading properly, new postings acting like they didn't take but did which resulted in a lot of double-postings and a few other glitches in theirs so I'd guess that it's down trying to get those issues fixed. RC Universe went through a really big mess last year and it was a lot worse. RCU is owned by Internet Brands which also owns vBulletin. Members there, especially the plane guys made a mass exodus over to RC Groups because it was so bad.
It appears like this site has been pretty much glitch-free in the past year or more so I don't think that you have anything to worry about. If they offer you an upgrade though I think that I would stay with what you now have if at all possible as their new programs suck.