I'm playing Assassin's Creed 3 with my Logitech Rumble Gamepad F510. When I start running (hitting RT) I can't stop. This makes it impossible to continue playing, because I can't complete missions where I would have to aim (because aiming is not possible while running). Is there something I could do to solve this problem. I played the predecessors successfully with that game pad and I'm using XInput mode.
I think this is a hardware problem not a software one so calibration in Windows is not going to help.
The button is most probably going bad. You should be able to fix it by opening up the controller and cleaning with a brush behind the RT button. The only problem with opening the controller though is that the assembly is delicate and there is a chance you might pull a small wire and the entire controller will stop working.
There are tutorials and video available online on opening the controller properly. Do either that, or buy a new controller.