Thanks Jim for pointing that out to me. I tried the "Compact and Repair Database" menu option, which had not positive result. Then I tried the "Convert Database" option from the same menu, and during the "conversion" I got the following error:

"There were compilation errors during the conversion or enabling of this database.
This might be due to old DAO syntax that is no longer supported."

Which of course tells me nothing. Does this look familar to anyone?