you may think the word "destroying" is exaggerating but unfortunately it isn't and I see no reason as to why this is happening.

Here is my system info requested in the "read this first" thread.

PHP Built on: Linux
Database Version: 5.1.48
PHP Version: 5.2.14
Web Server: Apache mod_fcgid/2.3.5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635
Web Server to PHP interface: cgi-fcgi
Joomla! Version: Joomla! 1.5.20 Stable
JoomSEF Version: 3.7.4


Here is what the content should look like and what it looks like when not using SEF:
index.php?Itemid=3&option=com_content&view=article&id=3&catid=7


http://i51.tinypic.com/25argbt.jpg


Here is what it looks like when SEF is being used:
"/cast"

http://i55.tinypic.com/bgaet1.jpg

What could be causing this error?

I've used JoomSEF before and it not have issues like this but this is such a huge issue that I have request support.

Error in probably in the code of the page, Maybe in some extension of Joom SEF. Please, write, which component, eventually Joom SEf extension, are you using.

I already said the component...

com_content

Can you look in your SEF Url Manager at this links and send me SEF and Non-SEF URLs? Bug must be in the code of the page, becouse SEF works fine. Maybe, that in the URL is missing some parameter, that is necessary for the script.
Probably there is some part of code, thah is missing and its why the page looks strange. Try to look in page source code to check, where is some HTML format problem and then find the part of code, that generates this code.