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The prob is with XP and the gameport address for the HAT#1 UP signal + F/A-18.
There is no problem in any other game. It may seem like your HAT1U is stuck but it isn't.
The fix?
Simply reassign HAT1U as NOTHING in your keyboard assignments. By default it is set at LOOK UP. Just keep clicking on HAT1U with your mouse until you GRAB it
then drag it over to the list of commands and drop. It may seem difficult to do since the HAT1U key will always try to keep it showing on the screen, but it can
be done.
First press the keyboard key you want to assign. Then while HOLDING DOWN that key, use the mouse to select which function you want assigned to that key.
Drag it over and drop.
If nothing else, just edit the key commands file manually.