In 6.1, I select Tomcat 6.0.16 and Java EE 5 and whoo-hoo! I get the grid.
I try it in 6.0 and no dice. Maybe I need to restart it?
Restart. Try once again...and...nope.
Well, OK. I can use it in 6.1. If 6.1 crashes or behaves in otherwise flaky beta ways, I know I can probably download the slightly later 6.0.1 that MJ downloaded a few days ago and use that. For now, let's continue in 6.1.