That is a good question. I have not had that issue...
Figured it out. Be sure not to drag the Device Name or Device Class HTML links. Anywhere else in the row will work.
Nice find! Thanks for the update, I'll add that note to the answer above.
Or you can do this from the command line or a script:
I've tried this in 3.0 with both Firefox 3.6.8 and IE 8.0 with no luck. My cursor just turns into a circle with a slash through it when I try to drag and drop any device, indicating that I can't move it. What am I missing?