Platform: bundled JRE, Windows 2000, Alloy.IDEA L&F 1) Start background task 2) Click progress icon to show background processes window 3) Drag the background processes window around on the screen, especially towards/over the borders - but keep 'mouse drag' active. After a while the window starts jumping around the screen wildly - I mean it jumps around much more that would be expected from my dragging. I looks like a positioning algorithm that freaks out. Nothing bad seems to happen though - usually after such flashing around the progress window somehow minimizes itself again.