EXCEL 2003 Graphs Not Displaying Correctly in EXCEL 2007?

I have a user that created some EXCEL bar graphs in 2003. They are not displaying correctly in EXCEL 2007 – there are just thin lines where the graphs should be. WTF??? I could see the problem POSSIBLY happening if it was a graph created in 2007 not displaying correctly in 2003? But THIS??? HELP!!! Or am I just going to have to have it PDF’ed?