@sourceminer We don’t have restrictions on opening new threads. There is no need to post in an old one, especially if your issue is quite different! So please open a new thread for your issue and tell us more about your setup as this is most helpful in most cases: OS version, FOG version.
Beside that: See I am not a graphic wizz but do you know about things like alpha channel, color depth and stuff like that. Maybe that image you exported can’t be handled by iPXE, maybe.