Suz, I believe it was GliderRoo that had stated that Lima Beans were toxic. But it has always been said just the RAW lima beans.
I have not had any issues with feeding them to mine neither. I will say in the beginning of glider owning, I was one of the people who were afraid to, and it was Alicia that told me the lima beans in the freezer section were not going to kill your gliders...she was right. I still offer them every now and then, just dont feed often because they are very high in protein as well.
Heres a link that will give you the complete breakdown of the lima bean.