I've managed to export a fixed layout epub from inDesign and everything renders fine in iBooks on my iMac but for some reason no images are shown when viewed in iBooks on my iPad. Does anyone have any idea what is going on?
I think this is the issue with the image dimensions you are using. Make sure the images are less than 600 X 600 px for them to look fine on iBooks. The images will not appear if they exceed this limit.