I recently upgraded to Yosemite and I seem to have some sort of line on my desktop near the dock that won't go away. I've changed my background, moved the dock and even rebooted and it stays there. It looks like something that I can click on and drag up but it doesn't do anything if I click on it. Did I install something that is causing this? 
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This is a progress bar under Downloads folder. It sometimes doesn't go away after completing the downloads. One solution for this is to enter this command in Terminal:
killall Dock
This will reset the Dock.
Mateusz Szlosek
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This problem persists since Mavericks. I really don't know why Apple hasn't fixed this yet. The only workaround that I know of is a restart or the killall Dock command in terminal.
Andrei
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killall Dockin Terminal.app. I sometimes get the same progress bar under Downloads folder in Dock and it doesn't go away after finishing downloads. – Mateusz Szlosek Dec 05 '14 at 14:41