I am using the latest Nextgen Gallery, 2.0.33, and when clicking on any gallery in "Manage Galleries", I get a completely blank page. Not the best situation for managing anything!
I am able to upload images ok, and even though it says "0 images uploaded" they are there. Everything else seems to work ok.
One gallery is at http://www.humortimes.com/6576/rob-rogers-editorial-cartoons/