No problems that I know of, lately. Someone else mentioned trumpet vine. I might try it. My chickens have cohabited with the MGs for one season. Then too, I read somewhere that clover is poisonous to chickens ???
I did a quick research on "clover poisoning" and it didn't take long for me to decide that it is a non-starter. Of course that is just MY opinion.
It does appear to be an issue with horses eating a lot of spoiled (ie, mouldy) clover (Melilotus officinalis and M. alba). A few cases of cattle and sheep "poisoning" were described and again it was related to spoiled feed. I did not find one valid report of clover toxicity in poultry.