was trying to slightly change the background colour on a style that I created and keep getting this error message. I get the same message no matter if it is a style I created or one I uploaded from VB.org. It won't let me center the header or change fonts either. It's a BIG long error message and I only copied the first paragraph and changed my board name for my privacy. I am able to create new styles by uploading xml files from VB.org but I can't edit anything new either. How can I fix this?

Warning: implode() [function.implode]: Bad arguments. in /admincp/css.php on line 103

http://www.vbulletin.com/forum/showthread.php?t=250756

According to the thread you linked to, the issue is related to your webhost. Did you add that code to your .htaccess file as suggested there?