WordPress Administrator may miss Add New and Delete plugin options
It seems absurd, but WordPress Administrator may miss Add New and Delete plugin options! This happens in multisite installations or after such installations are separated into autonomous blogs.
In such cases the famous Superadmin, that now simply does not exist, keeps enjoying these privileges, which means that no one is able to delete or add plugins without ftp access!
To solve this problem, you need to reclaim your lost power. To do that install Capability Manager, a plugin that provides a simple way to manage role definitions. It will let you change the capabilities of any role, add new roles, backup and restore roles and capabilities, and, what you need right now, to revert Roles and Capabilities to WordPress defaults.
Install this plugin, revert to the default WordPress capabilities, and enjoy again the power of addition and deletion!