I've encountered the same problem. Wheezy AMD64 update fails with message:
"trying to overwrite shared '/usr/share/doc/libxrender1/changelog.Debian.gz', which is different from other instances of package libxrender1" -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: https://lists.debian.org/[email protected]

