The Disappearing Joystick Issue--Why Won't LM Address It?

Thanks everyone for your feedback.  No amount of tweaking the standard.xml file worked for me, but I was able to get FSUIPC working.  I just had not been using it right.  Now P3D still shows "mouse yoke" as the controller, but I can at least calibrate the controls with FSUIPC.

You should turn off all controllers in the P3d UI so even the  Mouse Yoke is grayed out. That is, unless you want to use the Mouse Yoke for something.

If FSUIPC works then it isn't P3d that's causing the issue. As long as you found a workaround, I wouldn't worry about tinkering any further.