I'm having a bit of the same issue with one of mine. The 38's, which I did not segregate the seeds when I planted them as they all looked about the same, are planted in two different areas. One area has started to make pods, I even got a few seeds from one plant, but the other area just isn't setting pods. It's growing (quite vigorously compared to the area setting pods) and blooming a little but not a lot, and not setting pods. Looking at them you would think they were different beans. The way all these are segregating on me, they might be. But I think the real difference is that the ones growing vigorously but not setting pods are in an area really rich in organic matter. In past years I stacked partially composted cow manure in that vacinity before waiting for it to break down, and I'm sure some leached into this area. I think there is a lot of nitrogen there compared to the other area. The other area is still very slow though.
I will have some seeds from the 38's, I already have. I'd like to get some seeds from a different vine though. The seeds I've gotten are all from the same vine and look nothing like the seed I planted. I have about 8 vines total of this one and will have seeds from several different vines at the end of the day.
But I only have one plant of what I'm calling 39C. It's a pole and while not hugely vigorous it's growing OK. It's blooming, just not setting pods. I have yet to find one baby pod on it. I have plenty of wind and I often shake the trellis to try to help pollinate it. The vine itself does not look threatened, it is still healthy and growing. This one is not in a high nitrogen area.
Some of the other 39's are already finished, a 39A bush. The 39Bs, some pole and one bush, are producing but slow to dry out. They will get there. I'm just wondering if my current problem children, both pole, are just long season beans. My temperatures have been in the 90's so maybe it's a bit hot for the pods to set, but the vines are holding up to the temperatures quite well, looking healthy and growing. Other beans are setting plenty of pods. I think some of it is that some take longer seasons than others. I'll wait until the end of the growing season to pass judgment on which I want to grow again.
Annette, I was surprised to heart you are getting beans that look a lot like what you planted. I'm not getting that at all. Hopefully yours are well on the way to finishing segregation. I'm going to collect more beans and let them dry out so I have the final colors and patterns before I do another bean show, but some of my results have been really interesting, colors and patterns.