In Win 7 (RC x64) I'm experiencing the same problem that occured after version 1.3 as described in thread '
VSB 1.3 & Vista'.
The suggested fix there worked perfectly for Vista but now for Windows 7 it causes VSB to crash when testing a theme and will not save themes either.
To summarise the problem without the workaround applied- only after boot up Windows will not log in. VSB works perfectly and using AveStyler or manually switching the theme works fine in Vista or Win7, but after a reboot you cannot get past the login screen. The only fix I could find was to boot in safe mode and use regedit to manually switch the theme back to Aero.
Again, that's the problem experienced since 1.3, but only now on Win7 is the workaround suggested crashing VSB.