[please keep me CC'd, as I'm a digest subscriber on this list]

Suddenly "C-c a a" (`org-agenda-list') has started giving me this error:

   args-out-of-range #("  ots:        " 0 14 (org-category ...

Backtrace attached.  This is with today's bleeding edge Org Mode code,
pulled from git://orgmode.org/org-mode.git.

I think the bug must be content-sensitive, since the only thing that
changed was the content of some of my .org files (the ones listed in
`org-agenda-files').  After encountering the bug, I upgraded to
bleeding-edge org-mode, and saw that the bug reproduces there too.

I can't find much on the Net about this problem, though this expired
StackOverflow question seems to be the same thing:

  http://stackoverflow.com/questions/9460109/when-i-press-c-c-a-a-to-view-agenda-i-get-a-args-out-of-range-error

That question is gone from StackOverflow now, but Google's cache still
has it:

  http://webcache.googleusercontent.com/search?q=cache:QsaNSsILOegJ:stackoverflow.com/questions/9460109/when-i-press-c-c-a-a-to-view-agenda-i-get-a-args-out-of-range-error+emacs+org-mode+agenda+%22args-out-of-range%22&cd=5&hl=en&ct=clnk&gl=us

There are also some reports of org agenda exports failing similarly, but
I'm not doing an export.  And there's this, about how blank headlines
cause a similar error:

  http://comments.gmane.org/gmane.emacs.orgmode/46444

Oh, I just found this -- it might be relevant:

  http://article.gmane.org/gmane.emacs.orgmode/41045/match=agenda+args+out+of+range

I'll see if I can reproduce what that person found.

Anyway, I can do Elisp debugging, and will start to do that unless
someone here recognizes this problem and can add some information.

Backtrace attached below.

-Karl