Wow, that's a pretty drastic bug to experience! I must admit I wasn't a fan of the auto-installer so I'm glad they changed it. I'm just really waiting for a compatible Plus! before I install it.....don't wanna break over 8 years of Plus! chat logs
I gave it a quick try in VM with a test account on release day and thought it was fairly similar to WLM 2009 (despite the usual alarmist responses of people saying it's "all changed"). I haven't tried the social integration yet but look forward to seeing what it can do as I'm an avid user of Facebook and am definitely looking forward to Facebook chat integration