A mate alerted me to the fact that five of my videos on YouTube were appearing cropped/narrowed/compressed. I contacted YouTube with this error - as they had played fine when I uploaded them well over a year ago.
YouTube Support requested I sent the links to the videos, which I did, explaining that these had worked fine when I played them in YouTube before.
Gmail has a lovely and subtle feature where you can see where someone has cut and pasted a response, these portions defined by a different text colour.
Without answering my question, they simply told me what the recommended video size/formats/frame rates were for uploading to YouTube. They ignored the fact that I had said I uploaded them along with about 30 other videos in the same format which weren't affected - which DID comply with YouTube's recommended formats.
So, I'm left with the options of leaving them as they are or deleting them, losing my hit counts and the people who'd favourited them, reuploading them and hoping that the same problem doesn't happen again.
These videos incidentally were The Amazing Race, Newsreel, Sync Or Swim, I Still Call St. Lucia Home and Intimate Injunctions. I'd post links, but hey, they're not going to be there for much longer anyway.