First off, congrats and thanks for the hard work on the updates. Nitro is one of the best plugs ever made, and now I can use it on my new MB Pro. Now comes VW2--an old favorite, improved!
VW2 is a running a little buggy on both PC and Mac in Live 6. It causes the application to quit unexpectedly at odd times. While I'm not 100% certain that this is being caused by VW, it seems likely, since the crashes started after installing VW. Sorry, but I can't provide you with more detail than that. I was also surprised at the CPU load, until I turned off the FAT switch...That is one powerful little switch!
MacBook Pro, 2.16ghz Core2Duo, 1GB RAM, OSX 10.4.8
PC, 2.4ghz P4, 1GB RAM, Windows XP SP2
MOTU 828 MKII
Live 6.0.3, both platforms