i have just come across a similiar error in 0.33.4 (except its close to tray im using) it has been running for the last 5 or 6 days in the taskbar + tray but just before i decided to close the main windows and just have it in the tray neither the left or right mouse buttons work but the information popup from hovering the mouse over the icon is still in realtime
i have no idea how to replicate it but its still there unfortunately
edit: like 1 minute after i posted this a download finished with a balloon popup and i was able to use the tray icon like usual and open the main window again, very strange
edit 2: im using windows 7 ultimate 64bit