This is a known issue on some PCs. Do you mind sending me your log file and the System Info box from the main menu?
I figured out the problem, if you launch it without setting your ram limit to higher than what it default sets it to, it will not let you play or make a world. Append this to your JVM arguments so that it doesn't do this again:
-Xmx1G
What this does is set the max memory allocation to 1 gig instead of the 0.25 it was set to before. I hope this helps anyone else who runs into this annoying yet easy to solve problem.
Edit: Apart from that annoying bug, it's a great tech demo, I'd love to see how it goes.
Hmmm...
I'd love to see the reports then, as using a 32x Java that argument worked perfectly fine.
What I DID accidentally do was use the Xms argument instead of the xmx, however JVM was smart enough to set min/max to that. It worked perfectly after that. I'd love to see if I can maybe help with this project.