If this error message appears during normal run time, it is probable that the database has become corrupted and needs to be compacted or repaired.Yup. It's a corruption issue. But compacting and repairing the back-end database did no good. The corruption was apparently in the front-end database file. After I compacted and repaired the front-end, the problem went away.
Thursday, January 3, 2013
"The width of a Unicode text column must be an even number of bytes."
Just received the above error message in Access 2010 when clicking on a checkbox. There's a description of the error here, which conveniently says