Yesterday I updated to version 1.9.11 of Nextgen gallery, and now I can't do anything. I have wordpress 3.5.1
When I click on the links in the Gallery menu in the wordpress dashboard (Add gallery / images, manage gallery, albums, tags etc...), I first get sendt to the page I clicked and then automatically the page refreshes and I get sendt to the "Error 404 - Not Found" - page.. I can't even go into gallery options, so I don't know if there is something there. I have tried to deactivate an reactivate the plugin, but no help.
What can I do?