The patch to 4.0.3 may fix your problem, the following text is from Curious Labs patch page: "This will update the Windows and Mac version of MetaCreations' Poser 4.0 to Curious Labs' Poser 4.0.3. This updater includes several fixes and including a fix that enables Poser to run on systems where the total memory (RAM + Virtual Memory) exceeds 2 Gigabytes" . Your problem may be that you are exceeding 2GB total memory, hence the crashing. Hope this may help.