A week ago Monday, the A/R database was corrupted - about 21,000 Auto
Master entries were not present for a Detail Key. We saved this Base and
then restored from Friday Eve's backup.

This Monday, the S/O base root file was corrupted and couldn't be
opened. Again, I saved the DB and restored Friday's backup.

There is no write activity at all on the weekend - just reports, except
for our DB Expand Utility. This has now happened the two past times this
was run.

The clues are - (1) The backup copy just before File Expand is perfectly
fine. (2) The DB is in a trashed state immediately after the File Expand
as evidenced by all the Quiz jobs that *E*-out with a Corrupted Root
File error.

I strongly suspect the File Expand product. I'm in the process of
creating a few Quiz Analyzer jobs that will run right after the File
Expand.