I must say I really like the new features and the look, and firstly, I wanted to share only my enthusiasm, however, I must report this:
I saved and closed cubase 6 project with muted loop mash, 3 unmuted Sonics SE and 1 GA One.
After re-opening the project and after initiating playback cubase crashed with no report except the default win7 info that cubase has crashed etc.
On a second try, I removed the track with the muted(!) loop mash and it worked well.
Windows 7 32bit, q6600, 2gb OCZ DDR2, GA-G31 S2L