Hi,
When I try to add a new field I've this error:
Direct Access to this location is not allowed

Also when I try to access to "User Management tab"
I've tried to disable all plug-in without success, also update recaptcha

any ideaa
---
CB Version Your version is : 1.9
PHP Version 5.3.21
Joomla! Version Joomla! 2.5.8 Stable [ Ember ] 8-November-2012 14:00 GMT
Joomla! Platform Version Joomla Platform 11.4.0 Stable [ Brian Kernighan ] 03-Jan-2012 00:00 GMT

Did you ever get this solved? I am having the exact same issue