I am under the impression that some parts of org-mode/contrib have not been
upgraded
to the latest org-export hooks names:

C:\Home\.emacs.d\vendor\org-mode\lisp>grep -e org-export-.*-hook *.el
org-bibtex-extras.el:;;  (add-hook 'org-export-first-hook
org-eval.el:This should go into the `org-export-preprocess-hook'."
org-eval.el:(add-hook 'org-export-preprocess-hook 'org-eval-replace-snippts)
org-mtags.el:(add-hook 'org-export-preprocess-hook 'org-mtags-replace)
org-static-mathjax.el:(add-hook 'org-export-html-final-hook
'org-static-mathjax-hook-installer)
org-wikinodes.el:(add-hook 'org-export-define-heading-targets-headline-hook
org-wikinodes.el:(add-hook 'org-export-preprocess-after-radio-targets-hook
ox-icalendar.el:                        (let
((org-export-before-processing-hook

ox-icalendar.el:
org-export-before-processing-hook)))
ox.el:;; Eventually, two hooks (`org-export-before-processing-hook' and
ox.el:;; `org-export-before-parsing-hook') are run at the beginning of the
ox.el:(defvar org-export-before-processing-hook nil
ox.el:(defvar org-export-before-parsing-hook nil
ox.el:   (run-hook-with-args 'org-export-before-processing-hook
ox.el:     (run-hook-with-args 'org-export-before-parsing-hook

Maybe not of a very high priority, but I thought it was better to mention
it.

-- 
Fabrice