Hmmm. I don't know much about bean diseases, and have never really had much trouble when growing them (other than getting pole beans to produce decently
). Maybe I've been fortunate.
If someone more knowledgeable on beans doesn't chime in, you might want to start here and have a look at some of the pictures:
http://vegetablemdonline.ppath.corne.../Bean_List.htm
The first picture looks like a burnt leaf to me. Also, it does sound like you might have gotten the wrong seeds for the Roma (it happens).