I've started experiencing the same issues on yakkety, even after reinstalling unity8-desktop-session. My machine is a 64-bit with integrated Intel graphics - unity8-dash.log attached.
** Attachment added: "Log from .cache/upstart" https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1620934/+attachment/4736902/+files/unity8-dash.log -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1620934 Title: QEGLPlatformContext: eglMakeCurrent failed: 3001, nothing works, all apps, dash are just black windows To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1620934/+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