That's a bummer, Marion, I was on A when I discovered Pro and there is a major difference to me.
The A works for me but not nearly as well. The only side-effect the A caused me was very vivid, peculiar dreams. Fortunately, my mind is programmed in full Pollyanna so my weird dreams were quite entertaining.
Sometime ask me about the one where I was competing in manual wheelchair icecapades. It was a stellar performance!