Ahh, the old PPS vs PPT issue. Yes, that makes sense because the PPS is a compiled version of the PPT file--such that it does not need to be opened by PowerPoint itself. Thanks for the update. I think we ought to add a user-friendly message to users in cases where a PPT file has been inserted. So as to avoid this kind of troubleshooting. It is odd though that the PPS does not run from the experiment file and only does so successfully from a que file. And finally--can you confirm that this is a Power Point 2007 PPS file that is working ok?