Direct Pad Pro

I understand that Direct pad Pro may not work with the Genesis controller due to a problem with the LPT1 port on newer mother boards and chip sets. However, I was wondering what kind of problems would it cause. I am trying to work on a reason why my set up isnt working. Im not sure if its due to interface I built or if its this compatibility problem. Everything seems to be ok right up to the point I go to configure the controller. Number 2 and 3 buttons seem to be always pushed while the joystick goes crazy. It wont allow enough time to swirl the pad and then center it. It just jumps from Swirl, push a button, Center, push a button to it being calibrated before I can push a button. I first tried it on a 750 Athalon running ME with DirectX 8 and then on a !.4 Athalon T-Bird 98SE with DirectX 8.1 and both had similar but not identicle problems. Any help or suggestions? Thanks.