Thunderbird weird behaviour, mouse cursor whites out screen
 

Arch linux, recent installation, Thunderbird has been working well so far.

FWIW, I have Thunderbird running in two different OS's on a multiboot machine; both of them have their mail-folders and address-book entries sym-linked to a data partition, a system that has been working well for me for a year or two.

Just started happening earlier today... some of my folders I can click on, but clicking on others either just brings up a blank pane, or the mouse cursor changes to a rotating/buffering cursor, and if I move the mouse around the screen, it "whites-out" the message listing in the pane, observable in the horrible-quality video referenced below. The messages themselves don't seem to be affected, I can access the same content from another OS on the same machine. If it means anything at all, the two folders that *do* open normally when I click on them are the two folders with the smallest number of messages stored in them, but *none* of them are storing ridiculous amounts of messages. (Nor am I using more than a trivial percentage of available disk space.) The "buffering" cursor will continue indefinitely, but returns to normal when I click again on one of the two folders still acting normally.

View My Video

Does this behaviour look remotely familiar to anyone?