[Wyn]

I'm not sure what the "official" answer is but I have a client who is in EXACTLY the same situation,
Cinema 23 sitting on top of a C24. His whole rig has only been in service a couple of weeks. PT 6.2 on G4 Dual 1.2 mdd w/ HD3-one Accel card, one HD card. Early on, it was apparent he would not be comfortable with the monitor resolution Digi's instructions call for during setup. We changed it and, while there have been a few bumps and system freak outs, none have been traced back to the monitor resolution setting in OS 10.2.6. We have not done any extensive midi testing yet.