I just installed the preview 1.2.1320. The display has a couple of issues on my MacBook Air:
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at first, it came up completely blank. Nothing showed in the window. The window was apparently slightly bigger than my physical screen.
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I resized the window, and things appeared, but the sizing seems to be off. I've attached a screen shot showing the issue.
Sometimes the content is too small as in the screen shot, sometimes too large with edges cut off.