I have tried both the java file and the windows installer version of Tracker 4.7, and when I try to load a video (I've tried .mov and .avi), e.g. by dragging the video to the Tracker workspace, the load dialog stalls at 20%. I have had to go back to version 4.0, which works fine (instant loading of video, as opposed to time consuming load even to get to 20% in version 4.7). I am running Windows 7 64 bit professional on a school laptop.
I hope many of you will have a chance to install and test this beta within the next week. Please send me feedback, both positive and negative, on your experience with installing and running this new version. I hope to release version 4.70 no later than July 13 :-)