Okay, I'm going to scream over here. I uninstalled sonar completely, and then went and manually deleted everything related, except for my sessions and their respective audio of course. I made sure everything was gone and then I deleted the free plug ins I had on my machine as I wasn't using them much anyways. Then I ran reg scrub and got rid of all the 190 problems it brought up. Then I restarted the machine and reinstalled sonar four. As soon as I opened sonar, I got the exact same error message: Sonarpdr.exe has encountered an error and needs to close. And when I try to send an error report, it freezes at ninety nine percent. *pounds fist on desk.* The manual and forums I've checked so far mention sonarpdr.exe errors, but, not in this context. Any other suggestions from anybody out there? I never had this issue with sonar 2xl or with sonar 4 producer until now. I'm getting a new desktop with sonar five producer but it's not going to be here for another four weeks at least and I've got work to do. Thanks, Cameron.