Multiple Master problem - PP 2004

[zibits]

My mac Power Point 2004 is refusing to maintain a design from another presentation master -- even though I have the right boxes checked, and am copying over -- as instruction manual says...

Can anyone help me figure why I can get the slide moved, but lose the master from the other presentation? The other presentation was built from my own master, with a color change only to the to the original.

Gratefully...