Some html attachments makes Balsa hang

Hi,
some emails with html attachments make Balsa hang s.t. I have to kill  
it and
I have to remove these emails from my inbox by using an editor.
These emails comes from the German Post (DHL).

What can I do about this (work around / debug).
If somebody wants to try it him-herself I'll send this email
as an attachment.

Thanks,
Helmut