That version is now dead
http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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This problem seems to have been fixed in 17.10 under X11.
** Summary changed:
- Sections of screen flashing, window shadows flashing, corruption
+ Sections of screen flashing, window shadows flashing, corruption, with
extended desktop
** Description changed:
+ Whenever I use an extended
** Attachment added: "video to show idle flashing etc"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1722108/+attachment/4965324/+files/out.ogv
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** Attachment added: "still image of corruption"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1722108/+attachment/4965306/+files/corruptX.png
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