Anthony,
Definitely look at the xlb file as Gord suggested. Henry has already ruled
out a runaway Aut

pen or Workbook_Open macro. When things are weird ,
there are a few other things we routinely do. Can't hurt:
Look at "Excel acts generally goofy" at
http://www.smokeylake.com/excel/vfaq.htm. Try those things.
The workbook may be damaged. Depending on your version lf Excel, you may be
able to repair it. File - Open, click the dropdown in the "Open" button and
do "Open and repair." If you don't have that (your version of Excel is too
old), send it to someone with a later version who might be able to do this.
Are the applicable service packs installed for your version of Excel? You
can download them from microsoft.com.
I'm hiding under the table as I say: I hope you have a backup of the file.
Good luck.