Use AE CC2014. The newer versions have broken this feature. Adobe does not seem to care that it is broken.
broken what? png import? care to elaborate on what exactly is broken?
I have no problem importing Png files. Op please give us more information about this png file. is it able to import to other versions of Ae ? (you can install other versions along side)
give us your workflow details. how do you import?
if you can, upload the file.