Cross Discover DJ scratch wheels unstable

Hi!
Problem is as follows: In Cross, spinning the wheels does work exactly as expected - but only occasionally and just for some seconds. Most of the time it's like the software totally ignores any movement of the wheel controllers. All other controllers continue to work just fine, only the wheels go away. When analyzing the messages realtime in a MIDI monitor, it shows the wheels emitting controller messages all right, so it seems to be some software bug.
Other observations I made: When the program has been just started, first the wheels seem to work always, but stop to do so after a few seconds. Then after switching Scratch/Search mode and toggling Play/Pause or moving both wheels at the same time, after some time it works again shortly (of course I can't determine if one is caused by the other).
Hardware platform:
Windows Vista Home Premium SP2,
Intel Core2 Quad CPU @ 2.4 GHz
4GB RAM
Software Version is 1.2.9. I tried to look for an update, but didn't manage to find any for Windows on the downloads page.
Problem is as follows: In Cross, spinning the wheels does work exactly as expected - but only occasionally and just for some seconds. Most of the time it's like the software totally ignores any movement of the wheel controllers. All other controllers continue to work just fine, only the wheels go away. When analyzing the messages realtime in a MIDI monitor, it shows the wheels emitting controller messages all right, so it seems to be some software bug.
Other observations I made: When the program has been just started, first the wheels seem to work always, but stop to do so after a few seconds. Then after switching Scratch/Search mode and toggling Play/Pause or moving both wheels at the same time, after some time it works again shortly (of course I can't determine if one is caused by the other).
Hardware platform:
Windows Vista Home Premium SP2,
Intel Core2 Quad CPU @ 2.4 GHz
4GB RAM
Software Version is 1.2.9. I tried to look for an update, but didn't manage to find any for Windows on the downloads page.