Premiere Pro CC Trim Window not working...

Not sure if anyone else has encountered this problem. But whenever I pull up the trim window using the "T" key, as soon as I hit the spacebar to playback my footage, the trim window closes. It's impossible for me to play back anything in the trim window. I can trim left and right but not play back the footage.

I don't understand because this problem only occurs on my iMac i7, not on my Macbook Pro Retina.

Has anyone else run into this problem of the trim window closing as soon as you hit "spacebar"???
 
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