Thank you for having responded.
FSUIPC does not interfere with the mouse, although I seem to remember an old bug in the PMDG aircraft. Have you made sure they are fully updated?
Answer: Yes, it is up dated.
And you're suggesting that before you "set the thrustmaster t joystick" this did not occur?
Answer: Yes, it is that when configuring thrustmaster, I specified the reverse for the Boeing 737-800 from PMDG. In this aircraft, only the mouse "arrow" appears and moves, but can not operate on the commands and buttons of the aircraft. As I did not specify the reverse for the Boeing 737-900 PMDG, on this and other FSX-SE aircraft the mouse dio functions are normal.
Richard