This is what happened when trying to load up my client four times in a row now. Anything outside of that frame I can't click, so I can't go to my settings or check online friends or accept invites or click to create a game, etcetera.
I'm not sure what's going on. I'm going to try a fresh install after uninstalling, but I'll leave this here so hopefully people who can fix it will be aware that this can apparently happen.
EDIT: Even after a fresh install the problem still persists. Does anyone have any ideas?