I've seen this behaviour before when upgrading from 9i to 10g and when converting from Windows to Linux. The thing to do is open the 10g-windows-created file in the 11g-linux editor, put everything in its right place and then save the file. It should render correctly after that.
It's unfortunate as it's a labour-intensive solution. I'm not sure if this is a bug or if .rdf files aren't intended to be platform- and version-independent.