I've done some icon changing and wondering any1 know what could the solution to this: Skype and Youtube app icons just won't change, I've tried .png and .svg and none works..they are right resolution and names are correct.

Also, is it possible to change easily the squarcle icons (to square) in adressbook and the call icon(the one when som1 calls me and shows pic of the caller)? I'm just not rly a fan of the squarcles at all :P