ATI2013 and Win8.1 "TIB Mounter" unknown device

Hi there,

Windows 8.1 with mediacenter
Acronis 2013 6514
Does anybody else has the problem that the Acronis TIB Mounter is listed as unknown device (device manager)?

So far mounting a image seems to work without any problem but this "unknown" device seems to my system to go to sleep.

S22