I'm not sure what changed, but after fiddling around with the parameter order, it worked when going back to -F -user blah, which is what i had cut-and-pasted the first time around.

Anyway, thanks for the ideas..

Edit: I have virtual box installed and was trying to get some tricky Windows programs to run inside it a while ago, but i wasn't feeling like doing a new linux install inside it to play with the sdk today.

You make a good point about messing up my current install, though.