I tested it on the newest Thunderbird version 15 on Ubuntu Quantal with the dictonary above that was available. Here it works as expected.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/103003 Title: Unable to choose dictionary in Thunderbird with only Mozilla's XPI spellcheckers To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/103003/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs