My render window that tells you what its doing does disappear at times when my scene is complex as you say, but if i leave hte computer alone... the render happens to just appear. i always choose the render to appear in its own separate window.

On very complex scenes -- more often than not -- P5 will choke on the render. Even if P5 is the only program running.

You can have a super-hot computer, with tons of RAM -- and this problem will still persist.

Some of the render tricks like changing the Bucket size can help -- occasionally. But usually not.

I solved this problem by purchasing Vue 4 Professional (Vue Infinite should be arriving in my mailbox sometime in the next week or so -- it's supposed to start shipping tomorrow).

Since I now render my Poser scenes in Vue, I no longer experience Poser's render lock-up problem.

Something To Do At 3:00AM