Multiple Screens Disables Monitor Video Preview

I have noticed a new bug (for me anyway) that on my Mac Pro with two video cards I cannot load clips into the monitor and get a preview. I see the clip thumbnails in the timeline, but no video preview. I just tested this by unplugging my secondary displays and that resolved the issue. Haven't yet tested with the laptop using an external display.
I did just update to Mac OS 10.9 Mavericks, but I was seeing this behavior prior to that. Anyone else seeing this behavior?

Hi -
Thanks for your post and attention!!
I could reproduce your problem on a Mac Pro with two graphic cards. The video could playback in Timeline panel and could hear the audio, but could not see the thumbnail view in Monitor panel. I have opened a bug for this and our team are investigating it.
Thanks & Best regards,
Jenny

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