I was trying to do some minor voting and commenting on my iPad and each time I tried to complete the action, I obtained the following alert:
Could not perform this request with your account. Please try logging back in. If this persists, let us know on meta.
This happened here and on SE Biology. I logged out and back. No improvement.
I then logged onto my laptop and was able to operate as normal.
So I am posting this question on meta, as requested (although more in hope than expectation).