When in manned 1st person view, the camera undergoes constant extreme roll around the center cursor, switching from clockwise to counter clockwise at a fast rate that seems specifically chosen to be nausea inducing. The helmet outline and other 2d HUD elements are not effected, just the 3d elements (terrain / environment). The problem happens near constantly for me, though using 'C' to cycle through the 3rd person views and back can cause it to settle down, at least temporarily.