Hi Lars,
That's what I was thinking too, except that template::richtext:;get_property (from memory so may be slightly wrong) has no trouble parsing message_body into content and format. However, you still may be right - I ran into a similar problem with passing around a multiple for checkboxes. Maybe my experiment calling get_property wasn't executed when I thought it was.
I'll give it a try and let you know what happens.
thanks,
janine