Sorry to the developers for what was once a respected plugin.
Using 2013 theme and NextGen plugin only, on a small family photo site. Nothing much is easy to configure and lots of common (well I think they are) functions fail.
On an iPad, try this:
1. Select 2 images from the ipad photo album and upload them. Also notice they are uploaded with the same file name
2. Manage Gallery and notice the 2 images are the same
3. Delete one. The remaining image is now also corrupted