Only admins are allowed to see videos

After I posted a YouTube video inside of a topic all links on that site (for the video itself and even for signatures) will be replaced with the following text:

[Only admins are allowed to see this link]

Guests and members can't see the videos and other links!

HTML is ON for the affected post.

My forum settings are:

General / Messages and e-mails / Configuration / Allow HTML: Yes

The profile settings are:

Profile / Preferences / Always allow HTML: Yes

Examples for this error:

1.) http://www.teltalk.org/t202-telecommunication-commercials

2.) http://www.teltalk.org/t11-excellent-tel-videos

What else I can do to enable guests and members to watch YouTube videos?


Added information:

Now I have the problem with pictures, too:

http://www.teltalk.org/t200-comic-strips

But in another topic they are still working:

http://www.teltalk.org/t205-how-will-cell-phones-look-20-years-from-now

To set the permissions for each forum

In ACP>>General>> Forum>>Categories and forums>>Forum Permissions Control.. click on permissions and set and save... Do this for every forum

Thank you so much!

Problem solved!!!