Comment 14 for bug 872207

I've been dealing with this one on not only my ubuntu 10.10 machine, but my parent's 10.04 machine in another house for months now. So I'm positive, this is not just personal settings on my machine, which are at fault. I have noticed the behaviour occasionally in Firefox. But its mainly a Thunderbird issue for me, when I try to delete junk/spam mail by right clicking on the Junk to access the drop down menu. The drop down menu then disappears, when I try to empty the junk. I'm presently now running the latest lubuntu and linux mint 12 releases in vbox and so far I've not noticed the erratic behaviour in their Thunderbirds (although that may just be temporary good fortune.) At first I thought the cause was related to the ubuntu Updates informing me, that updates were available for download, as that was when the problem occured. But thats not always the case now.