Works Fine!
Im not sure what kind of device people that are reporting all of the problems are using, but Im on an iPad Air and the app works fine, yes there are a few pop up ads, but there is an X in the corner to close them. I think as far as accessing the library and taking photos, adding photos some may simply be having difficulty figuring out how to use the app.
Instead of the annoying tips displaying at the beginning when you turn on the app, there should be a link that goes through a tutorial. You just page through the features and learn how to use the app.
I also think you should be able to fade the edges on the photos so they will blend without lines.
An undo button would also be great. Sometimes I accidentally move a photo and hitting undo to move it back to where it was would be great.
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