I updated to the new version of NexGen Gallery last week. I am currently on Version 2.2.33 of NextGen Gallery.
After the update, the Gallery tab moved for the Left Side Nav to the Top Nav and when I attempted to navigate to Manage Galleries or Manage Albums, I received the User Access Error.
I created a new Super-Admin Role and assigned all the available capabilities to it as well as a new user with the Super Admin Role. I was able to access the NextGen Gallery through this method, however CANNOT access it using the Admin account.
To clarify – I am using the Admin account that was created during the WordPress installation to access the manage galleries/albums pages and receive the access error.