Is gnus-start-date-timer running when your problem occurs?
It runs article-update-date-lapsed which conducts a regexp search
without saving and restoring the match data, as it should.
I believe that the patch below is necessary, _regardless_ of whether
it solves your problem. Does it? There may be other similar problems
in gnus or elsewhere. I could install the patch, if desired. An
alternative is to automatically restore the match data around _all_
timers, but Richard pointed out that this would lead to
inefficiencies.
===File ~/gnus-art-diff=====================================
*** gnus-art.el 01 Jun 2005 10:13:45 -0500 1.74
--- gnus-art.el 02 Jun 2005 17:21:40 -0500
***************
*** 3034,3053 ****
(defun article-update-date-lapsed ()
"Function to be run from a timer to update the lapsed time line."
! (let (deactivate-mark)
! (save-excursion
! (ignore-errors
! (walk-windows
! (lambda (w)
! (set-buffer (window-buffer w))
! (when (eq major-mode 'gnus-article-mode)
! (let ((mark (point-marker)))
! (goto-char (point-min))
! (when (re-search-forward "^X-Sent:" nil t)
! (article-date-lapsed t))
! (goto-char (marker-position mark))
! (move-marker mark nil))))
! nil 'visible)))))
(defun gnus-start-date-timer (&optional n)
"Start a timer to update the X-Sent header in the article buffers.
--- 3034,3054 ----
(defun article-update-date-lapsed ()
"Function to be run from a timer to update the lapsed time line."
! (save-match-data
! (let (deactivate-mark)
! (save-excursion
! (ignore-errors
! (walk-windows
! (lambda (w)
! (set-buffer (window-buffer w))
! (when (eq major-mode 'gnus-article-mode)
! (let ((mark (point-marker)))
! (goto-char (point-min))
! (when (re-search-forward "^X-Sent:" nil t)
! (article-date-lapsed t))
! (goto-char (marker-position mark))
! (move-marker mark nil))))
! nil 'visible))))))
(defun gnus-start-date-timer (&optional n)
"Start a timer to update the X-Sent header in the article buffers.
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