printscreen controls
forced crash
let me try
this is because you are powering 2 pistons at the same time (1 whit the redstone and 1 whit the block where the redstone is on top). They made this so your game won't crash. Far as I know it is random where the bottom piston and top piston fires first.
also have to say that it only happens very rarely. like 10 min every week or so. was just pointing out that it is out there. I'm also sure that it is not my mouse because I dont have any problems like this in other games/programs