Going mad - don't know if it is a general Excel chart problem o
specific to Macs (or my MAC?)

Various charts I have put together seem to change format at will
usually when I save the file or print it. Changes are usuall
restricted to font sizes of chart/data labels, sizes of text boxe
and sizes of pies. Not even consistent - for example a shee
containing 6 pies (printing on one page) will change the format an
display of 2 or 3 of the pies but not the rest even though all ar
derived from the same original so have the same formatting an
options

Any suggestions gratefully received

Apologies if this has been discussed here before