conversations-inbox-widget
flashlight-applet

Some others too but I don't believe they could be causing the problem (installed most of them after it first happened 3 months ago). Pretty sure I've had the 2 above-mentioned before it first occured.


Edit: I THINK it first happened shortly after updating my conversations-inbox-widget (there hasn't been a new version for 3 months I think), but it could have of course coincided with installation of some other application (flashlight-applet? or something else).