Macbook Pro Retina trouble with projector after using Thunderbolt display

I used my macbook Pro Retina with my Thunderbolt to VGA adapter all through the fall, and never had any trouble with it. Just before Christmas I got a Thunderbolt display.
Since that time, whenever I connect the projector, I get a black screen. I can see and move the mouse, but nothing else. Other computers still work with the projector.
I'm not certain if the Thunderbolt Display has anything to do with this or not, but it's just the timing that it happened.
Grateful for anyone that can offer help!

It might be that the Thunderbolt output is set to the resolution of the Thunderbolt display, which the VGA adapter probably cannot display correctly. You can toggle between the video display modes using Command-F1... This will toggle the output between Mirroring and Extended Desktop. Using Command-F2 will allow you to attempt to detect displays. It might auto reset to the correct resolution using Command-F2. If you can get the VGA out to display using extending desktop then you can change the resolution to work properly with the VGA projector.

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