Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
Any news? FYI, I got this problem yesterday on a TIFF image. More precisely, the TIFF image was the result of a scan thus didn't contain any transparent pixel and the window border was visible. But when I selected View → Half Size, the window border disappeared. I don't see the point of making the window border disappear just because some internal algorithm to reduce the size apparently generated transparency (on the border?).
In version 6.9 (Ubuntu 14.04) PNGs with transparency continue to display sans window frame - certainly annoying that I can't move the damn thing from whereever it decides to popup on my screen