Why would CMYK values shift in my swatches?

On opening (a CS4) file for revisions (in CS5.1), all my CMYK swatches are slightly off in terms of percentages (not visually, but numerically by say tenths of a percent). By copying individual elements into a new document I discovered that the colors percentages were stable until I brought in a pie chart. The chart had been created in earlier Illustrator along with the other graphic elements. However, bringing in the pie chart threw the whole document color space into a problem. Even though the pie chart does not contain any of my swatches, all the swatches are affected.
Also, the document now opens with an asterisk. It has to be either saved or not upon closing.
There has been no change to RGB, and although the document contains some spot color, it is the CMYK swatches that are the problem.
Considering this document is subject to yearly revisions, I would like the colors to be stable. I want C-100, M-0, y-79, K-60 to stay that way, and not come up like they are, which is C-100, M-0, Y-78.91, K-59.77. My color space is Web Coated (SWOP) v2.
Any suggestions are greatly appreciated.

Exactly how is the color that is changing defined, is this a BOOK COLOR (eg: pantone)? Adobe has changed the cmyk breakdown of  colors, and usually you will get this error.
Unless they are book colors, then you get no warning and the situation you described.
Also check that your document color mode is the same between both documents.

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