Perhaps PilotHigh's problem is not enough RAM. P7 appear especially sensitive to that when it renders an animation, so if he/she is still working with 512MB or even 756MB, there might be problems. Poser 7 will work with 512MB, but "work" is a relative term. I have 4GB of RAM on a Mac Pro 2 x Dual-Core, but also run Poser 7 on a Macbook Pro with 2GB of RAM. No issues unless I try to render out a loaded-up 1,000-frame animation, during which it might burp around the 800th frame. Try rendering in a separate process (go to preferences and check the requisite box).