Transparency doesn't save when I save the file as PNG

[Poppydop21]

Well, I saved my file as a PNG then afterward viewed the file. When I viewed the file, I found out that the transparency in the image didn't save. I tried changing the compression settings but that didn't help.Where the transparency should've been was just black, which is very annoying. Please help!!! I am using Photoshop CS6 by the way.

[JJMack]

A screen capture and an example would be helpful.

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