Hello everybody,
here is the debug information you asked for:
DisplayLink Information
I managed to use Firefox 5.0 now without the Use Hardware Acceleration feature, but if possible, I would like to re-enable it in the future. The click/drag problem occurs with the Magic Trackpad AND any other HID device. I am using a Logitech MX500. If necessary I can screen capture the problem for you and put it on Youtube or so.
Thanks for your help!
mhhhhhhhhcookies