403 Forbidden in admin

[headbanginghippie]

Hi,

I've upgraded to version 1.6.6 and in the admin I get a HTTP 403 Forbidden result for some pages (e.g. siteprefs.php, editcontent.php, and addcontent.php).

The first time the scripts are called they are executed and displayed correctly, so I can edit the values in my browser. However, when I submit the pages, I get the 403 result. The strange thing is that when the page is submitted, the 'action' in the form is exactly the same page as the page that displayed the page. I've checked the checksums for the admin and everything seems fine.


Used Server:

CMS Version
1.6.6

Installed Modules

CMSMailer
1.73.14

MenuManager
1.6.2

ModuleManager
1.3.1

News
2.10.3

nuSOAP
1.0.1

Search
1.6.1

ThemeManager
1.1.1

TinyMCE
2.5.5

Comments
1.8.0

Cataloger
0.5.5

FileManager
1.0.1

Printing
1.0.4

Current PHP Version (phpversion):
5.2.6 Success