iPhone (iOS 7) App Icon Strange Behaviour

Question

I am facing the problem with the App Icon on the iOS 7 Device, the Problem is : I am getting a black border on the top corner of the icon. The Icon size & Name i used is:

Size :  120 X 120 pixels

Name :   [email protected]

(Sorry, I can't post the screen shot/Image here as i need 10 reputation points to post an image. Hope you guys understands)

Please help me.

Thanks in Advance !

EDIT:

Answer 1

iOS HIG guidelines suggest,

Avoid transparency. An app icon should be opaque. If the icon’s boundaries are smaller than the recommended sizes—or you use transparency to create “see-through” areas—the resulting icon can appear to float on a black background, which tends to look especially unattractive on the beautiful wallpapers that users choose.

Check if there is any transparency present in the icon, if yes, please remove it.

You should avoid rounded corner icon, because Apple applies masks to your icon image for this. Provide a sqaure-ish icon of dimensions 120x120 pixels.

Hope that helps!