[Brian]

I'm not positive that's a bug, but I can reproduce the behavior and it's certainly not helpful, so I'm going to write it up that way. :-)

Suggested workaround in the meantime would be to make a new window with the "visible" property set to False, do the export, then close the hidden window. Does that help?

I'll give this a stab, but I have more experience scripting OmniOutliner or OmniGraffle, so just in case you beat me to it, I thought I'd post the suggestion before I had a script together...