Ah, that's a pretty rough one. I don't have a clue what would be causing this at the moment, but I'll be sure to look into it & see if there's anything I can do for the full release. Thanks for the heads-up!

Update! Based on a few other reports, are you using SPACE to select the menu option? It seems like I missed a debug command and the E key is trying to open some gated-off dev tools, which can render as a black screen. Planning an update to fix this and some other technical issues before launch, in the meantime let me know if this helps.