Quote - I just bought Poser Pro 2010 (sidegrade from P8), and it worked great the first day.  Now, though, a mysterious problem has cropped up.  I'd been told a while ago that AO is unnecessary whenever IDL is activated, because AO is included in the IDL.  My own experience with P8 contradicted this (leaving the "Evaluate in IDL" box unchecked caused no loss of AO, but deleting the AO node did seem to result in AO-less renders), so I continued to use material-based AO along with IDL.   

I'm pretty sure that rendering using IDL disables light-based AO, but doesn't disable material-based. In any event, in Poser Pro 2010 if you do want to use AO (without IDL) you should use light-based, since it is now better looking and faster than material-based. (This is the opposite advice than from P7 and, IIRC, P8.)