Quote - If any Microsoft updates got installed recently (i.e. yesterday) I'd try reinstalling the latest graphics drivers just to be sure that they haven't been disturbed.

No Windows updates have been installed since I last ran P8 successfully a couple of days ago (I always manually download Win updates after being advised automatically by M'soft that one is there)

Also, I have no graphics problems at all with my other 3D programs (Vue and tSpace)

This is definitely a Poser program problem (- unless anyone can say otherwise ;-))