After upgrading my version of WordPress from 2.5.1 to version 2.6.1 using Fantastico, I have found major problems using the WordPress dashboard and settings.
Whenever I try to create a new category or delete a post, I am getting a blank page and WordPress is unable to register any changes.
I have been using Firefox as my browser and Windows Vista as my operating system.
I am wondering if these problems could be related to plugins like popularity contest, WordPress Sticky or other commonly used plugins.
Even after disabling these plugins, I am unable to use WordPress 2.6.1's dashboard or settings panels to create categories or delete posts.