The problem I have is pretty setup-specific.
I'm running Windows on an iMac. SU7 and SP 2.0b1. On the mac, holding the CTL key while clicking the mouse brings up the context menu. This appears to make it impossible for me to connect a joint to an object. That is - unless I'm doing the joint connection wrong: I've followed the directions in sketchyphysicstutorial/googlepages, so I don't think that's the case.
I can't find any way to disable the mapping of CTL key to context menu on either OS.

If anyone's had this problem and figured out a fix, I'd like to hear about it.

Mark