looks like a magnesuim problem. like - lkzz - said, try getting a complete liquid fertilizer with all macro and micro nutrients and take a spray bottle of 1 tbs epsom salt to quart of water and spray the bean plant also.
bean plants are really finicky about nutrients and growing conditions.
did you innoculate the beans before planting?

sorry epsom salt can be used as a foliar spray but is better as a drench. probably the reason you had some results but not a lot. mix it up and pour around the base of the plant.

Magnesium was the first thing that I thought when I looked at the pictures. Just so happens I discovered some Epsom salt in the closet when I was soaking a hurt foot.
I didn�t inoculate the plants, and I�d never even heard of it before reading about it on here. My dad�s been growing beans sine I was a boy and I never saw him do it. That doesn�t mean he didn�t. How do you do it, what does it do, and is it too late to do it now?
Or is it something done to the seeds? Also, how much of the Mg solution should I apply per plant?
Thanks a lot for your help; I really don�t want to lose these plants

1tbs per quart of water. some may say less or more. its up to the person. some people use a diluted solution of liquid tomato fert with all micro nutrients. it has calcuim in it also. that way you can hit all the nuts at once and not worry about a hit and miss. i did also say it could also be manganese and iron problem as well. that is why it is good to use an all around complete macro and micro nut liquid solution with a little epsom salt.
most people use an innoculant because they say it increases production and the survival chance of the bean to sprout. if you have decomposed material in your garden and not a sterile mix. i never have used it.

when i plant beans i usually use a complete slow release nut with all micronuts before planting. granted you can also use it as a side dressing at this point.

the only problems i encounter after doing that is maybe an iron problem which i correct with a chelate.

hopes this helps