currently on 5471, video preview on both MacBooks is ok!
sorry, typos: 5472 and 5473 not just freezing but really crashing
10.8.5 (MacBook Pro early 2011)
Would you mind trying 5475? It still hangs on the second opening of the preview on my MacBook Air/mid 2012, but the crash should be gone.
For those who updated to 5474 and cannot launch anymore at all: Sorry! Please download the full setup.