If you move a file that requires Admin rights to move, and move it from one
volume to another, it seems to move it twice.

In my case, moving a 2gb file:

1. Cut the file from C: and paste to D:
2. You get the "calculating time remaining" prompt, the disks go crazy for 3
mins whilst it copies the file from C: to D:
3. You then get the "You need admin rights to move this file" prompt - after
it's already copied it!  This is obviously to delete the original
4. Click Continue
5. UAC kicks in and prompts "File Operation" (if your moving to a network
share, you get a logon failure at this point)
6. The file it's just copies gets deleted
7. Disks go crazy for another 3 mins whilst it recopies the file

Jon