Excel error - remove some formatting
 

I have a workbook that is created from a macro. When I
open up the newly created wb for the first time (and each
time after that), Excel gives me the msg:

"Excel encountered an error and had to remove some
formatting to avoid corrupting the workbook. Please re-
check your formatting carefully."

But it doesn't appear that any formatting was removed.
The newly created workbook has 2 charts, some defined
names, and 4 worksheets, but very little cell formatting.
Any insight into this error would be great. My search
throught the Microsoft KB turned up nothing.

TIA
Jason
Windows XP Pro, XL2003 SP1