I suddenly am unable to open my org agenda.  Invoking ~C-a~ and selecting
any agenda command results in

~org-refresh-stats-properties: Stack overflow in regexp matcher~

The debug trace looks like:

#+BEGIN_SRC
Debugger entered--Lisp error: (error "Stack overflow in regexp matcher")
  re-search-forward("^\\*+
.*\\(?:\\[\\([0-9]+\\)%\\|\\([0-9]+\\)/\\([0-9]+\\)\\]\\)" nil t)
  org-refresh-stats-properties()
  org-agenda-prepare-buffers(("/Users/kev/Dropbox (Personal)/org/
2017_resolutions.org" "/Users/kev/Dropbox (Personal)/org/gcal.org"
"/Users/kev/Dropbox (Personal)/org/mobile-inbox.org" "/Users/kev/Dropbox
(Personal)/org/personal.org" "/Users/kev/Dropbox (Personal)/org/plebland.org"
"/Users/kev/Dropbox (Personal)/org/proposal.org" "/Users/kev/Dropbox
(Personal)/org/read.org" "/Users/kev/Dropbox (Personal)/org/recipies.org"
"/Users/kev/Dropbox (Personal)/org/reduxderiveddata.org" "~/Dropbox
(Personal)/org/gcal.org"))
  org-agenda-prepare("Day/Week")
  org-agenda-list(nil)
  funcall-interactively(org-agenda-list nil)
  call-interactively(org-agenda-list)
  org-agenda(nil)
  funcall-interactively(org-agenda nil)
  call-interactively(org-agenda nil nil)
  command-execute(org-agenda)
#+END_SRC

I suspected this was because I create a daily org file and have the dailies
in a wild card for ~org-agenda-files~ I have removed about ~300 files from
~org-agenda-files~ and it did not alleviate the issue.

The stacktrace above is without the daliy files

-- 
Kev Zettler
www.kevzettler.com