I use a 13 Macbook with a thunderbolt display on Yosemite. Since the installation of last osx version, if I try to open Time Machine I can only see a completely black screen on laptop screen. The other screen remains with previously opened windows. So, time machine is completely unusable. I can only use ESC to exit.
Any ideas of what can be happening here?
If I don't connect my second monitor, works fine.
This is my displays configuration: