I just wrote a post in Junior Varsity and it seemed to work. Then when I tried to save an edit, the system said my post was flagged as SPAM and needed moderator approval. It seems very sensitive....
Maybe the spam prevention service wasn't happy with "Win7" and "6.5.0" . Only users' first few posts should be submitted though-- I guess that doesn't work as expected when using 'edit.'
vBulletin 5 development / roadmap hasn't really worked out like we hoped it would. We'll be moving towards Wordpress / Xenforo as we have some time over the next few months.