It seems to be a driver issue. Perhaps vboxdrv or intel or whatever
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https://bugs.launchpad.net/bugs/1304265
Title:
Unity bugs out when changing screen size
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** Attachment added: VID_20140408_093151.mp4
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1304265/+attachment/4074144/+files/VID_20140408_093151.mp4
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