I few days ago i was posting a topic (http://wordpress.org/support/topic/390844?) about my problems with NextGEN. I had no problems creating a gallery or add images though.
I didn't find any solution to the problem so after a while I decided to try a reinstall. I uninstalled in the wordpress dashboard, then i deleted all nextgen-files, including the gallery I had created.
Then I reinstalled nextgen following the instructions. Everything seemed to work fine, but unfortunately I can't upload any images or create galleries.. When I click the button "add Gallery / Images" nothing is happening. The page is blank (I can see the sidemeny and header but nothing else)
I've been seaching around here for solutions but still don't know what the problem is and I haven't got a clue how to fix this.
I really want to get NextGEN working so please try to help me! Thanks!! :)