"Perhaps when the bug will show is also machine related, I've always got very little running in the background." It's certainly a possible factor. I violated my own advice when trying the render this morning. I was playing music through iTunes, which does eat up a big chunk of physical RAM. Interesting to see how max texture size seems to play a part. LaralynMcW, those factors are also likely to slow or halt renders. As you may know people often advise to save your scene, close Poser, then re-open the app and scene to render. Rebooting can help, too. Closing Poser is evidently the only way to truly purge RAM held hostage. I don't believe those memory-boosting apps do much to help during an active Poser session.