MacOSX & MSWord transparency support problem

I designed a letterhead on a Mac running System 9.1 using MSWord from MSOffice 2001/Mac. At the top I have a page-wide logo featuring a simple drawing and some text on a white background. On my system is looks perfect and prints perfect. When the file is copied to a Mac using OSX and MSOffice X it still looks fine. However, it prints with a yellow cast to the white background of the logo.

I had my client use the Set Transparency Color Tool to make the yellow disappear. However, this also results in the degradation of the anti-aliasing on the text in the logo (making it appear washed out).

The Microsoft website has been singularly unhelpful (what a crappy site!). Have any dopers run across this problem with transparency and do you have any suggestions for a fix?

P.S. I have received reports that a similar problem exists with PowerPoint files created and copied in a similar way with previously transparent colors reappearing.

Is the “simple drawing and some text on a white background” an object copied from another program such as Illustrator? Or just the drawing, with the text (and the whilte background) being created in Word? Or was the drawing done in Word using its drawing tools? Or for that matter imported from a library of clip art or something?

Whatever the answers, try varying them. Try redoing the letterhead on an OS X box and if it works under OS X copy it back to the MacOS 9 box and see if it is still happy there.

Thanks AHunter3, good points. The graphic was originally created in Adobe Illustrator, exported as a tif file and then inserted in Word (not cut and paste). I will try creating it in different ways. I’m afraid I don’t know how to use Word’s drawing tools at all (sigh). I’ll see what I can do on an OS X capable machine.