Using WP 3.5.1 and NextGen 1.9.12.
When I upload pictures (even just 5-6 at a time), it does not upload all of them. Rather, a small portion of them, but duplicates them up to 4 times, adding the extension _0, _1, _2, etc. to the names. I get no error messages, though sometimes it'll give me just a white screen.
I've seen other threads with this problem discussed, but each was closed with no solution offered - just a link to the plugin's page on WordPress (which I've searched and found not yet found a solution). Any ideas?