Board Thread:Bug Reports/@comment-30911884-20170902175031/@comment-32588442-20171126185338

Click out of the game (if you're playing windowed) or minimize the game (if full screen.) It usually takes a few minutes to load.

How I usually know it works - I leave the game windowed in the background, and leave to go do something else for a few minutes. Around 5 or so minutes later, sure enough, I hear the school bell ring and the game runs normally. It's just a momentary lag, at least in my case.