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Hmmm....
What is the security level (Tools | Macros | Security)? It shouldn't matter, but you might give lowering it a shot. Also, the XML is still being generated, correct? If so, and if you model has no subtypes in it, the resulting XML should be complete. Thus, if you have no subtypes in your model, the error could be ignored.
Scot.
Do you have any other software (e.g. anti virus) that is blocking macro execution loaded?
Otherwise, I'm stumped and can't reproduce this on my setups. Would you be willing to send me the file? If so, send it to my first name at object role modeling dot com and I'll try to take a look at it this weekend to rule out a problem (corruption) with the file itself.