I had arm lock enabled before dropping and turned "start in third person" off in the options.
In the game I toggled to 3PV and suddenly my RVN-4x had armlock toggled OFF and, weirdly, could move it's arms sideways. The arm-weapons fired at the arm-crosshair too, so not just a "cosmetical" bug.
Going back to 1PV and holding SHIFT to toggle armlock off I could move my view around like I had horizontal arm-movement (with the "weapongroup-ready"-indicators moving with the view), the arms didn't move sideways though (neither did the arm and torso crosshairs), just the normal vertical movement.
Before the 3PV switch, arms and view movement was normal in 1PV.
This behaviour was repeatable in a second game.
Edited by Ironwithin, 20 August 2013 - 02:55 PM.