I just thought I would add to this as a lot of people are asking the same question.
I have v3arcade installed on my board, which is running 3.7.2 and it works fine
While yes it seems that at the moment John hasnt updated v3arcade in a long time, its still the best arcade system in terms of professionalism. Yes, we could all go use ipb arcade as its updated more and has more games but with no disrespect meant to the author, it looks tacky. v3arcade is tidy and for that reason alone I intend to keep using it.
The only problem I am experiencing with v3Arcade with Vbulletin 3.7.x is that I am no longer able to fully import iB Games. I can import them so they appear in my arcade and are playable. But when it comes to submit the scores, nothing happens. The web browser acts like its loading a new page (score submission page) but nothing happens. I've tried this on both a live board, and also on a fresh install test board, same problem. I don't know if this problem has been solved already but if it was it would open up tons more games to v3arcade. I've tried searching with no luck. Just wondering if anyone else has had anymore luck? Perhaps I need to edit some files which I'm more than comfortable doing.
If anyone knows this solution, I would be in there debt

Many thanks.