I have a mysterious element appearing on my dock that looks like the indicator under a folder but isn't actually attached to anything - any ideas how to get rid of this?

Screenshot of my dock

If I turn on dock hiding it disappears when the dock is hidden but reappears when the dock is visible.

Hardware: Macbook Pro Retina 13 running OS X Yosemite 10.10.1

  • It's the downloading indicator [thermometer], should fill from left to right as a download completes, but it seems to get stuck in Yosemite. Yours don't even look like it properly belongs to the app above it. You found the fix, though. – Tetsujin Dec 10 '14 at 18:29

I managed to fix this by restarting the dock by running the following in the terminal:

killall -KILL Dock

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