I have same problem after drag and drop app from applications to plank.
i should logout then relogin to make the icon disappear.
lenovo Q190
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https://bugs.launchpad.net/bugs/1390625
happened to me since using the beta 1 version on both 32 and 64 bit.
about 30 minutes of lockscreen the screen got black and nothing happen.
should reboot though.
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