Steve-
i suspect that the lack of a CR calculation is due to a formatting error that Excel somehow inserts when it opens from Paul's OpenCalc version of the spreadsheet. The SU calculation obviously requires numbers, but some important cells get formatted as text, and the program cannot add "abc" to "1.34" for example.
The symptom of this problem can be seen on the Nations sheet- look for little green triangles in the upper left cells, particularly in the ACC column (this is where I found them), which indicate a number that is formatted as text. These are text because they are input from a number table that is also formatted as text.
That table can be found on the "Tables" sheet as the To HIT table. Cells B19 through B25 may also show the green triangles. If so, simply highlight those cells, punch "Format Cells" as "Number"- all SU are then correctly calculated- at least this is what occurred in my case.
If you version of Excel has a different affected site, the principle is the same- trace the green triangle cells back to their source data, re-format those data to numbers-- should work
lamont