Group 1 works fine here (VST2).
The (rather thorough) test

:
Added VCC modules to existing VMR instances (basically, modified presets):
1) VCC Mixbuss on Master, VCC Mixbuss on a bus, VCC Channel on a track, link on, all set to group 1, VCC Channel on another track, not grouped, close project, open project = Group 1 settings stay the same.
2) Adjust linked in/outs, adjust drive, close, open = Group 1 adjustments remain - ok
3) Unlink, adjust output, close, open = Group 1 adjustments remain - ok
4) Remove bus's VCC Mix Buss, change to VCC Channel , assign to Group 1, close, open = All Group 1's settings stay the same.
Repeat above 4 - exit then restart Sonar (rather than just close/open project) same Group 1 results - all ok.
Repeat above 4 with just VCC in VMR by itself - same results - all ok.