Infdev Blackscreens in atleast 5 seconds into the game.

I noticed that minecraft indev was added to the list of version files using the new "Time machine" feature. When i opened it up, it was perfectly fine. But a couple seconds in the game, it blackscreened. I looked at the main menu and it said that there was 3MB of ram allocated, even though i have it set it to 1333MB.

P.S. this is probably a duplicate bug, which i do not care about.