Neutrino - maybe they just didnt know how to respond. Could they be worried that your anxiety will affect their grade? If so, maybe thats why they dont want to put in writing that oh its okay - but consider that i am speaking from a litigious U.S.A. perspective.

I hate group projects so i sympathize - i had a group in business grad school that i hated, and the instructor loved the biggest blowhard in our group. I was like, yeah neither of you would make it in the real world - the problem with being an older student.

So anyway i would just wait and see about the other students, and in the meanwhile check with your disability advisor? I dont think the prof can say, i dont care, do it anyway.