Missing Text Changes

We are using Autocad 2004 in conjunction with Projectwise. I opened a dwg to check some text which I couldn't read clearly on my hard copy.
The text was not there. Go to the guy who edited the dwg. The text is there. Open the dwg on someone else's machine. The text is missing. He sends me the file via email. I download it, open it, and the text is there.
Anyone ever seen anything like this. Is there some problem with font files perhaps???
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