I have checked the folder paths. I can copy and paste a working icon (from an existing app) into the directory where the misbehaving icons are and the new app will build successfully. (I use the same naming scheme for my icons).
I did eventually get the images to work, but after converting through ImageMagick the PNG files that were generated by Photoshop. During the ImageMagick conversion it threw the following message:
convert: Ignoring incorrect cHRM white(.28056,.29582) r(.62075,.3401)g(.28308,.5865)b(.13095,.06423) when sRGB is also present `icon_BIG_512x512.png' @ warning/png.c/MagickPNGWarningHandler/1754.
Im not exactly sure, but it seems the source image has some kind of errors, and the ImageMagick conversion removes it. Doing the conversions through Photoshop i could not get the icon to work with Content Builder. It seems that the Content Builder checks that the PNG are accurate, and the image although saved as PNG that i was feeding to Content Builder didnt match the proper PNG specifications. The ImageMagick conversion ignores thus removes the misbehaving areas of the image that did not match the PNG spec.
