nbecker(a)fred.net writes:
 When I try to read the
 message in gnus (standard xemacs package), and choose decrypt off the
 mailcrypt menu, it says: 
 Found no encrypted message in this buffer. 
I reported this to the ding list last week, because I thought it might 
be a Gnus bug.  But then I used edebug-defun on mc-decrypt-message and 
friends, and found that mc-message-delimiter-positions was failing to
find the PGP introduction line, even though a manual execution of the
identical re-search-forward in the *Article* buffer found it just fine.
I just experimented some more, and found something very very weird
going on.  When I eval the defun of mc-gnus-decrypt-message directly
(mark around the defun in mc-toplevel.el, then M-w M-: C-y RET), PGP
decryption starts working.
That's the only difference between Gnus in XEmacs 21.2.b19 which fails
to decrypt and the same Gnus in the same XEmacs which successfully
decrypts: Eval the defun of mc-gnus-decrypt-message manually.
Perhaps a byte-compilation flaw?