I have had screen sharing and back to my mac set up for ages between my mac mini and macbook. It worked fine until now. I can still connect to my laptop from my mac mini, but it doesn't work the other way, and the majority of the time i am using my laptop to connect to my mac mini.
Same thing happening with me. I want to go from my Macbook to Macbook Pro and vis versa. But it will only go from MB to MBP not the other way. I set up both settings to the exact same thing. But nothing is working so far.