Hmmm, well before I say the corruption word... Take a look at the tables and make sure there are no links to an external spreadsheet.
Just in case...
Could be the begining of corruption...
http://www.granite.ab.ca/access/corruption/symptoms.htm. I would make a
back-up, make another back-up and then first try importing everything into a
new database. Also, read this article...
http://www.granite.ab.ca/access/corruption/retrievedata.htm. And after all
of that I would finish off with this article...
http://allenbrowne.com/ser-25.html and see if any of those circumstances
apply to you.
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Sorry this didn't help.
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