Still fighting this, W2k3 servers, non-SP1. Rebuilt both from scratch. Went to MPS 3.0, same issue, upgraded to PS 4.0, same thing, did change farm to another farm, some thing, however, I can get the application to run about ½ the time. The application in question, for testing, is notepad.exe. Thoughts? Chad Schneider Technology Analyst/Citrix Admin. Bemis Company, Inc. 920-303-7609