Hi Tom,
Sorry for the delay. Most of the team is at the Microsoft MVP Summit this week. We appreciate your patience.
In general, I don't know why this would happen unless the actual data type was a text field (as opposed to rich text). That would be one thing to check - i.e. did you bind a rich text control to a plain text field by mistake by adding the rich text data type first with a control and then changing it to plain text afterword.
At any rate, we'll try to repro this tonight. I will ask Don Lambatin to respond.