Hi Stefan,
after i removed the camera, the problem was gone. But you should state, that removing it from the programme is not enough. At least the old configuration directory needs to be renamed. Otherwise it reload the old settings while adding the "new" camera.
I am now using the 3.5.2. without any problems right now.
By the way: Is there a was to get icon in the task bar for the service? If you need to change some settings, you must first stop the service, run the AbelCam application, quit that and restart the service. That is not very convenient in my eyes