->Do you know how to count the number of formats?
No.
But here's the thing. According to that MS entry, you only run into a problem when you have around 4,000 different formats. Do you think you might have that many? If so, let me just point out that that is ridiculous. How could you possibly need 4,000 different formats?
It seems very possible to me that the workbook is just corrupted, and that there are not actually too many formats.
But if 4,000 different formats seems possible....
As far as vladk's suggestion goes, you can do it for all cells at once.
And "Perhaps I could create a quick macro to go through every cell in the workbook and change the font to Arial, but not change any other aspect of the font" is WAY over-engineering it.
To try the two things that have been suggested so far (clearing formats from blank cells and changing all fonts to Arial), there is really no reason to use a macro. Just do the following:
[ul][li]Select all cells[/li]
[ul][li]This can be done two ways:[/li]
[ul][li]Click on the square to the left of A and above 1[/li]
[li]Press [Ctrl]+[A][/li][/ul][/ul]
[li]Change the font to Arial[/li]
[ul][li]That's it. The other aspects of the fonts won't be changed[/li][/ul]
[/ul]
With all cells still selected:
[ul]
[li]Go to Edit > Go To > Special > Blanks > OK[/li]
[ul][li]This will only select completely blank cells, not cells that have a formula displaying "" (a zero-length string)[/li][/ul]
[li]Go to Edit > Clear > Formats[/li]
[/ul]
Please post back with the results. I'm curious to know if that helps.
[tt]_____
[blue]-John[/blue][/tt]
[tab][red]The plural of anecdote is not data[/red]
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