After I upgraded to Ubuntu 14.04.5, which has a new version of ImageMagick, I no longer see the problem. Not changing bug status since I'm not sure that's the right thing to do when the bug was reported against an older (but still supported) distribution which may still have the bug.
> lsb_release -rd Description: Ubuntu 14.04.5 LTS Release: 14.04 > apt-cache policy imagemagick imagemagick: Installed: 8:6.7.7.10-6ubuntu3.4 Candidate: 8:6.7.7.10-6ubuntu3.4 Version table: *** 8:6.7.7.10-6ubuntu3.4 0 500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages 500 http://archive.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 100 /var/lib/dpkg/status 8:6.7.7.10-6ubuntu3 0 500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1351050 Title: Weird iteration order when displaying multiple images To manage notifications about this bug go to: https://bugs.launchpad.net/imagemagick/+bug/1351050/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs