I'm bummed. I upgraded to 2.7 and had to upgrade Nexgen-Gallery. I couldn't do the 'auto' upgrade so I tried it manually. I can't get rid of the warning:
"Sorry, NextGEN Smooth Gallery works only in Combination with NextGEN Gallery"
Alex Rabe's site directs us to put our support requests here. I didn't see (doing a search) anyone having the same problem. It's almost like it doesn't see NexGen Gallery.