Karmasurfer sez:

... if you post again after posting a post that is not square, it will post properly.

(The previous post; that is, the one that's too wide. Like the video I just posted. And so on.)

So here's hoping.

UPDATE: Karmasurfer was wrong. I can't figure out why my train-station dance video is so obnoxiously wrong. WAY too wide, as you can see.

UPATE 2: Ugh. That video is blocking my Very Cool Sites list, so I can't click on Eagle Cam. Only solution: Keep posting till it drops down far enough.