ch fighterstick buttons not recognised

Hi AllI just downlaode x plane.I am having problem with x plane not seeing all the buttons on the CH product fighterstick.At each start up different buttons are recognised-and its never more than 2 or 3.I have the latest ch driver v4.51 installled.I am fsx user and I have had no such problems with fsx.Can somebody please help-I tried the x plane forum but its very limited and it does not allow to post topics.So far my experience of x plane has been very poor-if I cn set up the joystick may be I will be able to experience some of the fun many are claiming.Many tanks for all help.Qas