In using Poser 8, most of my errors have been Operator Errors.  Poser 8 does have its quirks.  However after getting to know the software, you know how to head most of them off.  An example would be render hanging-that quirk can be handled by powering down the computer and bringing it back on line (re booting).  When the RAM fills up that happens--and it does it with every RAM heavy software.  Its like learning the quirks of Vista after finally learning XP.  Poser 8 is heads and shoulders above any of the previous Posers----IMVHO.  Jan