BBCode [Video] is not getting saved
 

So I was wondering why my forum stopped allowing video to show up via BBcode. I realized soon that it was because it was turned off under all of my forums. So I go in to turn it on, and I do. I click save, and it says save. But then I go back to test it out, it doesn't work. It's still missing. I go back to the forum under my admincp again, and lo and behold, it doesn't save. What is wrong? This is the same situation with every forum on my site. What is going on?

Try disabling your modifications/plugins and see if you still have this problem.
Note: To temporarily disable the plugin system, edit includes/config.php and add this line right under <?php

Yeah that doesn't help.

Keep in mind that the tags themselves still work, it's just that most of my bbcode unsavvy users don't know how to use it. So as a result, we just get links instead of the actual videos.

Also any other option besides the [video] options in the forums preferences work. i tried turning off html or image, and it saved. and i tried turning them back on and they work.

If your users are only posting the link, and not using the tags ("most of my bbcode unsavvy users don't know how to use it"), then it's not going to work. You need to use the tags.

I think I may not be being clear. The problem is not the bbcode doesn't show up, or that videos aren't being registered as video. All of that is fine and dandy. People easily could just tag the videos or whatever. But the problem is that that the video button, like the picture button in the formatting area of creating/replying a thread does not show up at all. That's incredibly inconvenient for my users. I know I could tell them to just tag the videos, but why can't they just press a button that does it for them.

Let me show you what I mean if I'm not being clear.

http://img822.imageshack.us/img822/6972/vbulletinf.jpg

In your config.php file, what do you have for this line (is it uncommented? What type of datastore?):

There's nothing changed with it, it's just that exact same line
"// $config['Datastore']['class'] = 'vB_Datastore_Filecache'".

I don't know what datastore means.

OK, so what is in your error_logs (if you don't know where they are, ask your host) when you try to save the forum settings?