That's what I said - if I'm holding the block up with the LMB, and then I press the RMB AS WELL, to rotate, the block always drops away. Maybe there is something wrong with the way Java reads my trackball mouse? I've never had any problems with other software, but who knows?

KEV: Ah, I need to learn to read, I've changed the control slightly now so you can hold the right button alone to rotate. Might help some.