The mouse is working properly in the menus. However, during game play, the mouse is constantly pulling up, so that I'm always looking at the sky.

Is anyone else experiencing this issue?

Are you using a Logitech G 502 proteus core? The software for that mouse, regarding surface tuning has a bug that can cause that to occasionlly happen in games. Last I check Logitech had no interest in fixing it. The bug can be avoided by not using the surface tuning feature.

I'm experiencing this same problem, haven't found anyone else having it and the solution is not clear. I'll let you know If I find anything.

bump

I had the same problem until i disabled the driver for the vjoy virtual joystick in the device manager. So if you have joysticks or gamepads connected try unplugging them and disable vjoy if you have that installed.