It seems I found the reason for the synchronizing problem on my Audya. Yesterday I had a long conversation with the Ketron hotline and they looked via remote into my Keyboard. They changed files, checked the HD.... After that I tested it another 2 or 3 hours, still the same problem. Today I called again the hotline and we decided that I will send the Audya for repair - looks like a HW problem.
When I came home from work I looked at my Audya and realized that I had connected a floppy drive on one of the USB ports. (I converted some legacy MS styles on my XD3 that the Audya can read it, so I used the floppy to copy the styles to the HDD)
I disconnected the floppy drive and the problem was gone. I connected the floppy drive again - it took me not one minute to provoke the problem.
So it seems, that connected devices on the USB ports have influence on that specific problem. It also seems that it is depending on the kind of device connected - e.g. a memory stick causes no problems on my Audya.

Joe


[This message has been edited by Joe0710 (edited 04-07-2010).]