Mountain Lion appears to break VNC connection to a headless mac mini.

I connect to my headless mac mini with VNC.  Under lion this worked perfectly.  With Mountain Lion on my mac mini I can connect but many windows do not update properly.  If I connect an external display to the mac mini all is well again.  Any solutions?

I use splashtop.
Able to reach iPad resolution when i connect to my iPad, when the splashtop session ends, it drops back to 800x600.
Maybe you could try it out and see if splashtop helps expand to 2560 x 1600.

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