When I re-open the file, often the charts have increased in size about 30%
*and* have shifted southeast on the page. This has happened frequently. This
is really annoying as I have to repeatedly re-size the charts to the correct
dimensions.

This is clearly a bug in program. It is reoccurring in several different
Excel 2007 files.

Does anyone know any more about this?

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This problem appears to be similar to this post:
http://www.microsoft.com/office/comm...xp=&sloc=en-us
Changing the properties to "Don't move or size with cells" (as suggested in
that post) did not solve the problem.