Recipe from "emacs -Q": 1. M-x show-paren-mode 2. Visit the attached file. 3. Type something at the end of line 3 (so that the following paragraph gets highlighted - This seems like a different but, BTW) 4. M-> At that moment, I see the "Emacs Abort Dialog", saying that "A fatal error has occurred!". FWIW, I've reproduced the above crash in two different machines: one with Windows 7 and other with Windows Server 2003 R2. ------------ In GNU Emacs 25.0.50.1 (i686-pc-mingw32) of 2015-09-23 Repository revision: 325200ac1dcf5bed6918ea827d8a48d89487e083 Windowing system distributor 'Microsoft Corp.', version 6.1.7601 Configured using: 'configure --host=i686-pc-mingw32 --enable-checking=yes,glyphs' Configured features: XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS Important settings: value of $LANG: ESN locale-coding-system: cp1252 -- Dani Moncayo