There are 27 tables.  Most are pretty small, less that 100 records.  Three have about 2000 records, and one has almost 3000 records. The largest has just over 19000 customer records.  These are almost the same every year.  The difference this year is I split all of the tables out where in previous years the only linked table was the customer table.  Also the other common variable is that we are now on office 365.  I mention that because 2 days ago I had trouble with security warnings that would not allow some text boxes to display dlookup values.  Now that I put my working copy of the database in a trusted location that issue seems to be fixed.

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Reply from Alex Hedley:

It may seem like a pain but try creating a new blank db and link one at a time, until you get your error message.