The process cannot be started while the Developer or the Topic Recorder are open on this computer
The following messages are displayed in a dialog box (Cannot Launch Recorder) when you try to record a Topic (or Missing Frames):
The process cannot be started while the Developer or the Topic Recorder are open on this computer. This error indicates that part of the Developer from a previous session is still in memory. Close the Developer and any applications you were recording, and then start them again.
The Recorder has previously terminated unexpectedly (or at least abnormally). You are trying to record, but UPK thinks that the Recorder is still running.
Close the Developer and the application you were trying to record (there is some 'shared memory' still allocated). If that doesn't work, you need to reboot your PC.