Im KRpano-Forum habe ich dazu mit Datum 14. Oktober 2011 folgendes gefunden:
"krpano supports only flatten Photoshop documents (psd,psb) at the moment, that means krpano will only read the background layer, all other layers were ignored,
PTGUI saves layered psd/psb files by default to be able to store the layer transparency (this is not possible with the background layer itself) - and in this case the background layer is just a big black image and this is also the reason why you get a black pano,
but PTGUI has also an option to save the psd/psb directly as flatten document,
best regards,
Klaus"
Gérard