Black screen when open Time Machine on Yosemite
Solution 1:
Unplugging my second display 'solved' the issue. Not ideal, but an adequate solution for me to get into Time Machine quickly on the odd occasion.
Solution 2:
If you have this issue using Yosemite, i found a turn around:
- Go to Preferences - Mission Control
- Uncheck "Displays have separate Spaces"
- logout and login
This will fix Time Machine to display black screen in one monitor. The side effect of this is you loose the abilitty to use monitors as separate spaces but isn't that bad.