Are you using Apple's Safari browser? I am, and the same thing happened to me. I had to switch to Firefox for it to work.
I have Firefox on my Mac and it worked.
yes, I am using Safari.
I went back and copied the URL in a new window and voted again. It worked just fine. Odd kind of work around.
Thanks for the tip though. This is not the first time this has happened and I never thought about using firefox.
I’ll try that next time.