Click on 'Show more Icons' on the Taskbar, then click 'Customize...'
Now at the bottom of the Dialog click the link 1. 'Turn system icons on or off' then in the following Dialog (at the bottom again) click the link 2. 'Customize notification icons' again, - now just keep repeating doing steps 1 and 2 for a couple of times, THEN try clicking the 'Cancel' Button - and see how many times it takes to close the Dialogs?
On the first time you click The 'Cancel Button' it should close the Dialog - right?
But instead it takes a couple of 'Cancels'
Crazy aint it?