[MlMt] no message display!

[Randy Bush]

> suddenly, this morning, mailmate does not display the text of the
> message body.  it will show me html, if i View/MessageBodyParts/HTML
> but it will not show me View/MessageBodyParts/PlainText
> 
> of course, i have changed nothing :)
> 
> i tried a re-install, turning experimental features off and on, ...

basically it shows html but not text.  so if a message is text only,
i can not see the message body except whan i Show / View Raw Message.

randy