First off, here are my system specs:

Motherboard: Asus A7M266
Processor: Athlon XP 1900+
Memory: 768 MB PC2100
Video Card: ATI Radeon 9600 XT (128 MB RAM)
Sound Card: Soundblaster Live! 5.1
Operating System: Windows XP Pro (with all service packs and patches)
Joystick: Logitech WingMan Attack 2 (USB)

I'm attempting to get Descent II (ver. 1.2) working on this system. Using VDMSound (ver 2.0.4) I've been able to get it 90% functional. I've got sound working (except during the cut scenes, but this doesn't matter to me), and my joystick is detected and seems to be working.

The problem that I'm having is that when using my joystick, the controls will periodically jump towards the upper-right side of the screen (that is, the cross-hair jerks up towards the upper-right side). This happens once or twice per second. Other then that, game play seems normal. Also, the problem does not appear in keyboard mode.

I've tried adjusting both the min/max scaling and the polling period options under the joystick parameters, but I've been unable to make the problem go away. I've also tried using an old Gravis joystick (which uses the gameport, not USB), but this also hasn't solved the problem.

I have also found this thread, which talks about the problem, but doesn't really give a solution: Can someone explain Joystick support?

Any ideas? Thanks in advance.