In windows 7 I found that some scripts only run in 32 bit mode so I loaded both Poser 32 and 64 (this is game developer. I have 11 but haven't loaded yet). D3D 'TANLINES' AND other scripts need the 32 bit emulator version. Most of the time I am running in 64 bit mode, but for scripts I occasionally open 32. I haven't had any prpblems with my runtime, but they are separate from the base directory (except some characters Like Victoria).