Distribution Folder Disappears Using Setupmgr.exe

Hello,

I'm trying to set up an unattended install (fully automated) from a network
share. Using setupmgr.exe, I follow all of the steps to create a
distribution folder, copying the files from my CD. At the end of the
process, setupmgr says that it's copying the files from the CD to the
distribution folder. After this, the distribution folder disappears
entirely.

I've attempted this twice: Once following the defaults (which created a
folder named C:\whistlerdist), and once using a folder I had created in
advance. Both times, the folders were gone immediately after the copying
process. I googled and saw only two people with a similar problem, but
neither had a solution. Has anyone here run across this before?

Thanks,
Mike