Gameport to USB Converter?

I have the CH Products Virtual Pilot Pro yoke and rudder pedals. They work and am satisfied with them. However, Periodically the aircraft elevators suddenly deflect up (yoke moves backward toward pilot) and the aircraft goes skyward. I have tried two different sound/gameport cards but to no avail. I cannot find anything that indicates that the problem is coming from the yoke itself. Could be the yoke, or the gameport software from CH, or the software from Microsoft. May be time to start the expensive FSX "required" uogrades.Before dropping $100 for a new USB yoke ($500 if you like steel yokes) I wonder if anyone has an opinion, or experience, with the gameport to USB converters selling for around $25??Regards,Dick BoleyFSX, 2ghz AMD, 1gb, ATI 9800 128mb