I have a problem with Multimedia Builder 4.9.8 . When I'd like to create a bitmap, it shows this message "Image load error". I changed size image or format type but it's not successful.
I had the same problem but when I changed the directory name into French (because it was in Arabic) there's no problem. It seems that MMB doesn't like paths with Arabic letters. Try it yourself.
This question has already been tackled here.