[camner]

What is really odd is that a variety of aliases on my hard drive (real aliases, not symlinks) now point to a backup drive rather than to my main drive. This is in addition to various dock icons pointing to my backup drive.

As a reminder, I started this thread with a problem booting off of my main drive (with no problems booting off of my Sandbox). To fix things, after making a backup (to an external drive, just to be safe), I copied my Sandbox back to my main drive.

This makes no sense to me. I don't use the backup drive except periodically to make an SD! clone.

I'm really torn between trying to fix bad links as they come up or going back to a month-old SD! backup (after saving my Desktop and Documents folders elsewhere to avoid losing work) and rebuilding things from there. That would be a lot of work, but perhaps safer?