Chart from version 2003 to version 2007
 

Hi

I have made two files, a and b, with line charts in Excel version 2003. The
files are apperently identical.

When I open file "a" in Excel version 2007 the line chart is shown without
any problems, and it is possible to change Minimum and maximum for the x-axes
and to choose months, year etc., so it is working fine.

When I open file "b" in Excel version 2007 the line isn't shown in the
chart, and it isn't possible to change Minimum and maximum months etc. for
the x-axes.

It seems like some formatting of the data has been done, but I can't figure
out what. The formats of the data seems to be the same, and the chart types
are the same. Boht Excel versions are danish. What am I doing wrong?