I am also seeing this issue, or at least something like it. I'll attach the relevant images and then additional system info and a description of what I'm seeing.
** Attachment added: "workspace switcher showing white window on all workspaces" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/935630/+attachment/2770610/+files/white_window-all_screens2.png -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/935630 Title: White rectangular To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/935630/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp