I found a video that played in stereo by default so I tried re-uploading the .flv file from my cache to YouTube privately to see how it handled it, but it just stays in "processing please wait" mode forever. Tried this twice. Obviously it isn't going to process it.

Any idea why?

I also notice it won't let you add an annotation link to a video with the &fmt=18 tag at the end, it automatically removes the &fmt=18