Unable to turn 360 degrees.

I just downloaded the Linux version of Minecraft for my Chromebook (right there it's already unsteady) but I am unable to turn all the way around. When I reach about 180 degrees, I cannot rotate any further unless I press escape and then go back into the game. A previous bug similar to this said to update the launcher, which the launcher is indeed telling me to do, but I cannot find a new launcher to download (I downloaded it yesterday, too).