Alex

IPB's SEO function does as well as vBSEO. vBSEO is just an automation of what you would do normally, nothing exciting. Your stats are only backup because surely if this site is relatively new, you're not getting too much crawler attention. That makes for a buffer zone of time before the URL gets dropped. Yeah, vBSEO developers stated they would update for 4.0, but again, you're still looking at some downtime with that. You're most welcome. Indeed. There's a reason a lot of people are dropping vB for Invision Community Forum. Once they get over the small learning, they realize how complete and powerful it is.

I should register for an account, but here I go. Those bad ranks are completely normal. If you set up 301 redirects with the correct code, you should be fine after a week. You're "screwed" either way since vB 4.0 has a completely different URL handling mechanism than 3.x.