Hi DBlank,
That's strange! The formula used is
not ({TableName.FieldName} like "??\")
Which then displays two errors. The first one is:
"Failed to retrieve data from the database." and gives the option to click 'Ok'.
Once clicked the following error appears
"Failed to retrieve data from the database. Details: 4200. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near "_\')' at line 1."
this only happens when a '\' is at the end of a LIKE clause..