Sébastien Vauban wrote:
>> The Attached patch avoids this bug by removing all text properties from the
>> subject (the same is done in org-wl.el).

>I've applied your patch. That hinders, indeed, the bug to occur. So, it
>perfectly shows you're right about the cause.

>Though, the patch you gave me causes me troubles in my Gnus buffers: the
>*Group* and *Summary* buffers are now black and white only. All my colors
>disappeared...

This is indeed the patch's fault.  Something I don't completely
understand yet, is when and why this kind of side effect occurs.
Anyway, attached patch supersedes the last one and should work.  It
creates and uses a copy of the subject string.

HTH
  -- David
-- 
OpenPGP... 0x99ADB83B5A4478E6
Jabber.... dmjena@jabber.org
Email..... dmaus@ictsoc.de