Hm, I just tried that on my forum and it worked just fine. If you see [youtubehd]zlfKdbWwruY[/youtubehd] in the post, that means you did something wrong setting up the BBCodes. Make sure you didn't misspell youtubehd. Take a screenshot of your admin area if you're still having troubles.

Thank you for your help Fangs, I reinserted the information just to doublecheck, and I still get the same error. It shows up fine in the admin panel, but not in posts. I have images here for you to look at. (I took them while at work, so youtube is blocked period, but on my home station, youtube regular & HQ works in posts, but not youtube HD).
Thanks again for your help.

Installed.. works Great! Thanks!

Hm, I'm really not sure why it's working for you in the admin panel and not working in posts. Does it work fine on your BB Code FAQ page? Make sure you have those last 3 options checked (disable smilies, word-wrapping, etc).

Fantastic...Thank you!

Hey Fangs, I checked those last three options. It does work in my BB Code FAQ, but it still doesnt show up in posts. I've gone through everything I can think of and I can't quite figure it out. I appreciate any additional help you can provide. Thank you.

nice work, thank You

Gosh, I'm all out of ideas. The only thing I can think of is that there's something weird going on with your theme that's breaking it, but I don't have the foggiest idea what it could be. Does it work if you use the stock default vB3 theme?

Really nice mod. Nice one.

Thank you so much!