Thanks, but I know that if I uncheck that box I wouldn't have any more problems, except that I wouldn't have the contents of my external HDs stored in memory, am I wrong?
The alternative is: leave "automatically remove offline volumes" unchecked and manually remove any offline volumes under Tools -> Options -> NTFS.
It would be nice if you could pin hard drives so that the script never forgets the hard drives you've told it to remember. So I tell Everything "pin this hard drive," and it asks me for the name. Then, if I search for a file and I don't remember exactly which external hard drive it's on, the script (in offline searches) shows me the name I gave it and the path, so I know exactly which hard drive to connect to find my file.
I hope this is an interesting idea and that others will appreciate it too. Thanks as always for your kindness.