I might as well do my part and try to provide some helpful information to Badspot. When I go fullscreen, I don't crash anymore, but my screen goes blank, I have to fix it by going on my config folder and setting fullscreen to 0. I think I got this fixed by changing the resolution. But now when I play blockland there's black on the left and right. I'd rather play widescreen (black on the bottom and top) also back in V16 I could have the resolution at whatever I want without a problem. Also btw, I noticed a few mac users have been having problems at the mainscreen. Their account isn't authenticating, I found two ways to fix this.
Restarting, or more quickly, clicking change BL_ID and re-imputing your BL_ID. Wouldn't this be an easy fix Badspot? by telling it to restart the athucate attempt after like 3 seconds of no progress, or adding a button that re-inputs your BL_ID? Thanks! Hope I can help.