Hello, I've just got the following backtrace when opening an org file. Unfortunately I cannot reproduce it reliably, but I was wondering if others had seen something similar. Debugger entered--Lisp error: (error "Stack overflow in regexp matcher") re-search-forward("^[^%]*\\\\usepackage.*{biblatex}" nil t) reftex-using-biblatex-p() reftex-locate-bibliography-files("/Users/schmitta/Documents/Org/") byte-code("…" [file master-dir file-found buf docstruct reftex-keep-temporary-buffers reftex-locate-file "tex" reftex-get-buffer-visiting buffer-file-name file-error throw exit nil message "Scanning file %s" reftex-get-file-buffer-force t bof syntax-table ((set-syntax-table saved-syntax)) set-syntax-table 1 re-search-forward reftex-match-string 0 7 "label{" fboundp TeX-current-macro LaTeX-current-environment match-data ((byte-code "…" [save-match-data-internal set-match-data evaporate] 3)) ((byte-code "…" [save-match-data-internal set-match-data evaporate] 3)) reftex-label-info 3 92 -1 5 "Scanning %s %s ..." rassoc 6 delq mapcar #[(x) "…" [x include-file string-match] 3] reftex-parse-from-file 9 reftex-init-section-numbers appendix 10 ...] 7) reftex-parse-from-file("/Users/schmitta/Documents/Org/boardgames-runx.org" nil "/Users/schmitta/Documents/Org/") reftex-do-parse(1 nil) reftex-access-scan-info((16)) reftex-parse-all() (progn (reftex-parse-all) (reftex-set-cite-format (quote ((98 . "[[bib:%l][%l-bib]]") (99 . "\\cite{%l}") (110 . "[[note:%l][%l-note]]") (108 . "%t (%a)\n[[bibdesk:/Users/schmitta/projets/bib/alan.bib::%l][%l-BibDesk]]") (116 . "%t") (104 . "** %t (%a)\n:PROPERTIES:\n:Custom_ID: %l\n:END:\n[[bib:%l][%l-bib]]\n[[bibdesk:/Users/schmitta/projets/bib/alan.bib::%l][%l-BibDesk]]"))))) (and (buffer-file-name) (file-exists-p (buffer-file-name)) (progn (reftex-parse-all) (reftex-set-cite-format (quote ((98 . "[[bib:%l][%l-bib]]") (99 . "\\cite{%l}") (110 . "[[note:%l][%l-note]]") (108 . "%t (%a)\n[[bibdesk:/Users/schmitta/projets/bib/alan.bib::%l][%l-BibDesk]]") (116 . "%t") (104 . "** %t (%a)\n:PROPERTIES:\n:Custom_ID: %l\n:END:\n[[bib:%l][%l-bib]]\n[[bibdesk:/Users/schmitta/projets/bib/alan.bib::%l][%l-BibDesk]]")))))) org-mode-reftex-setup() run-hooks(change-major-mode-after-body-hook text-mode-hook outline-mode-hook org-mode-hook) apply(run-hooks (change-major-mode-after-body-hook text-mode-hook outline-mode-hook org-mode-hook)) run-mode-hooks(org-mode-hook) org-mode() set-auto-mode-0(org-mode nil) set-auto-mode() normal-mode(t) after-find-file(nil t) find-file-noselect-1(# "~/Documents/Org/boardgames-runx.org" nil nil "~/Documents/Org/boardgames-runx.org" (1095881 16777220)) find-file-noselect("/Users/schmitta/Documents/Org/boardgames-runx.org" nil nil WILDCARDS) find-file("/Users/schmitta/Documents/Org/boardgames-runx.org" WILDCARDS) Thanks, Alan -- OpenPGP Key ID : 040D0A3B4ED2E5C7