Attached Link: http://www.curiouslabs.com/article/articleview/212/1/50/

from CL Faq (link)

Poser 4 and Pro Pack
The Poser figure is invisible. Only an outline of the body is seen with the cursor on it
The virtual memory is probably set very large. In the order of 4 gigs or more. Reduce the total minimum to 2 gigs or less. Restart the system.

For users who have 2 gigs or more of RAM and virtual memory, a memory updater would have to be applied.

For Poser 4.0.3 users, download the Poser 4.0.3 Memory Updater

For Pro Pack users, download the Pro Pack Memory Updater