RE: Bearded dragon eggs w/o shells, and a question on an ex-stud.
I'm going by a large beardie breeders place later today so I am going to ask on the odd egg. I would think it was either laid to early, it didn't form properly, or a combination of both. From either the lack of calcium, stress, or a combination again. But, I have NEVER heard of a beardie with only 1 egg. I am sure it must have happened at some point. So there are probably more. If she rejected 1 that was unhealthy, it could be completely fine. She could also reabsorb them, this does happen, especially if she doesn't have enough calcium. But, if they are malformed, or she is having problems in other ways, stressed, etc... She could become egg bound, and that can be fatal. Do you have some form of veterinary school on campus or that you are affiliated with? I would think that may be he best bet to have her looked at. It is hard to tell you what is going on unfortunately.
As for the male, just try different greens. He sounds healthy. If he is the same room with the female, he could be "randy" too. Try mustard greens if you can get them. Get a dish deep enough that the supers can't climb out of, put a thin layer of mustard greens (or whatever green you want to try, no lettuce), in there, torn into small pieces, /12" x 1/2" or smaller, and put a few supers on top. That is the first trick I try.