The problem seems to be caused by the upgrade of gtk+ to 2.10.7 on 1/8/2007 in feisty (see upstream bug).
** Bug watch added: Mozilla Bugzilla #355248 https://bugzilla.mozilla.org/show_bug.cgi?id=355248 ** Also affects: thunderbird (upstream) via https://bugzilla.mozilla.org/show_bug.cgi?id=355248 Importance: Unknown Status: Unknown -- drag&drop moving of message does not work https://launchpad.net/bugs/79289 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs