Diego, good news. I found the source of the problem in my case. The culprit turned out to be alltray - which keeps thunderbird in the system tray, in addition to keeping drag-and-drop from working :)
You might have something similar going on on your system (I imagine many many people will have forged a way to get thunderbird into the system tray, because it's just so darn convenient). If not - good luck finding your answer! refer to https://bugs.launchpad.net/ubuntu/+source/mozilla- thunderbird/+bug/79289/comments/37 for details -- ubuntu - can't drag & drop mail to personal folder https://bugs.launchpad.net/bugs/180359 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
