Quote - I  had the same problem. I uninstalled Poser 6, then reinstalled Poser 6 and applied SR3 immediately after. I rebooted my system and then started Poser. I haven't had the problem since.

That's also what I had to do and now Poser 6 with SR3 works perfectly.
Haven't had a crash or anything weird going on since.  It seems more
stable now with the reinstall and SR3.
E-Frontier really ought to tell people that this is what they should do,