When the windows is maximized... a weird graphic glitch appear at the final of the new bar...
Windows Vista Ultimate SP1 (x86)
Note: btw I don't like so much the new progress bar cause is not showing the real % that you are reaching of the whole space you are going to get free after cleaning but showing the % of the whole process depeding of what options you selected... each time it goes to a new item it advance xx%... but for example in 90% in my case stay veryyyyyyyyyyy long time because the free space wipping and the firefox clean up... this should be improved in next released guys...