NextGen Blanks Page

When activating NextGen, worked until today.
Tried on different browsers, re-activating it, deactivation other plug-ins…
Nothing…
What happened???
I didn’t change anything and now when its activated my page is blank!!!

The uploader works completely fine, the NextGen Gallery blanks the page no error.
Please tell me how to fix or need to update the plugin!
I got alot of users.

http://wordpress.org/plugins/nextgen-gallery/