If you have been working in Poser a while, close and reopen to free memory.  Trouble is, Poser uses that error as a catch-all.  Doesn't necessarily have to do with memory.  If you had a real problem, I think Windows would butt in and redo your page file.

Another thing, if this really is a bear to render, set your bucket size to 16.  Poser appreciates the help.  Might be something else that's bugging Poser, though.  Sorry :(

John