So we're trying something INTERESTING... Because the general internet likes videos and scrubbers while getting confused by preloaders and play buttons, we are now defaulting to the MP4 versions of movies when an MP4 version is available.
If you don't like this, here's how to switch back to SWF default: Below the credits and upload date, you'll see a list of formats that says "mp4 | swf" - click the link for "swf." This will save as a preference and you will always default to SWF when one is available, until you choose to click the "mp4" link under formats at some point.
You can try it here for example:
We can also FORCE SWF to be the default for special cases, such as interactive content or stuff that loops. I'm gonna be hunting those down now. If you know of items that should default to SWF for EVERYONE (not just your personal preference), please link them in this thread!