In Emacs 22.2, the first `next-error' in certain circumstances goes to the wrong error line in the target file. With the dummy file foo.txt below, and on a 50 line console, emacs -Q foo.txt C-v # page down in foo.txt C-x b Ret # back to *scratch* buffer M-x compile echo 'foo.txt:''150: an error here' C-x ` # next-error => goes to foo.txt with point at line 56 The echo simply produces a compilation buffer claiming an error at foo.txt line 150, but then next-error goes to line 56. On a different size terminal or under X you get a different wrong position, like line 45 or 24. The recipe above is rather specific, there's all sorts of ways it works correctly. If you don't scroll-up, or if you leave foo.txt the current buffer, then it's fine. I've struck this on various occasions without ever being able to reproduce it, since a second try in the same session goes ok! My recent-ish build of the current emacs cvs head still seems to have the problem too, whatever it is. In GNU Emacs 22.2.1 (i486-pc-linux-gnu, GTK+ Version 2.12.3) of 2008-04-11 on raven, modified by Debian configured using `configure '--build=i486-linux-gnu' '--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs22:/etc/emacs:/usr/local/share/emacs/22.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.2/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2'' Important settings: value of $LC_ALL: nil value of $LC_COLLATE: nil value of $LC_CTYPE: nil value of $LC_MESSAGES: nil value of $LC_MONETARY: nil value of $LC_NUMERIC: nil value of $LC_TIME: nil value of $LANG: en_AU locale-coding-system: iso-8859-1 default-enable-multibyte-characters: t