No images in downloaded eBooks.

I’ve recently installed this app as it’s the only way I can download online titles for my university research and read them on the go. Upon reading through the first book I noticed that there were huge blank areas with captions nearby indicating there should be images there. I’ve read a similar forum on this problem which was first written in 2007 and NEVER SORTED OUT. Please can I have some answers as to why these images aren’t displaying and also, if they are unsupported formats, why these have not been added to supporting formats.