TL;DR: Switching to the gunner's sight in the Maus, on the proving grounds, will lock up the game and force a hard restart. Thus if you have not saved your oversized rodent, it will be lost to digital gods.

Today I made the mistake of taking my freshly acquired (through extraction) and renovated Maus to the proving grounds. Having only done driving tests previously, the PG was new, but seemed intuitive. I parked my big baby on the mound to send some pain downrange, switched to the gunner position, and clicked on the gunner's sight. This stuck me in a flashing black screen that only showed the UI items. I could switch ammo, and I heard clicking sound from the game when I right clicked, but mousewheel and Esc were completely unresponsive. I tried all the hot keys, and got no improvement. Without any other apparent option, I hit the almighty Alt-F4.

To my dismay, an autosave had not occurred, and my beloved beastie was gone forever. It stung a little extra hard, since I had spent an hour figuring out that behemoth of a turret, and that massive V-12, of the rust bucket I had pulled out o the mud.

I wouldn't call that game-breaking, but that really sucked.

Please fix.