Sandbox gets mucked up
 

Yesterday I rebooted my machine, and much to my surprise and dismay, although my Sandbox booted, all references to the underlying drive on which the Sandbox is based had disappeared. It's as if the symlinks had all be disconnected from their targets! And, the main drive volume didn't mount (although it's physically on the same drive as the Sandbox).

I had no trouble booting off of the main drive, and all is (or at least appears to be) well there.

More details...there was a user folder which contained a user with the same name as my shortname, but it was not the same user folder as on my underlying drive. The dock icons for "documents" and "downloads" were question marks.

Should I consider my underlying drive to be suspect now, or only my Sandbox?

Did you rename the base drive?

Nope. I just decided to reboot because I hadn't in a few days and the symptom described above--to all appearances--"just happened"

I'd recreate the Sandbox, then. I have no idea why this would "just happen".