By Ragnarok.Sekundes 2014-10-14 18:27:05
I assume this continues to occur even after having re-logged or restarted the computer?
If so, then it's likely that there is an input from the controller is sending the positive Z axis forcing your view down. Have you tried unplugging the controller and temporarily using the keyboard controls to see if the view normalizes?
If it does you could check the controller properties in the devices and printers menu and see if the inputs look normal. If they do not, a reinstall of the drivers may help.