Morphious......after a load of a figure or scene or start up of a render, Poser will load texture files. Sometimes Poser can not find a texture and a dialog box appears....however, for some reason this dialog box is burried under the Poser application.
This appears as a freeze or a hang.
Do the CRTL+ALT+DEL and select Poser in the APPLICATIONS box then select SWITCH TO button.
If this is the problem, the looking for texture dialog will pop to the front. Worth checking.

OpenGL still stable after setting "Let Application Control OpenGL" in the Navidia control panel. 
Three days now no crashes....!