Unable to accept answer for a question with a bounty
I have a question on Super User that I would like to accept an answer for, but there's no checkmark to click next to any of the answers.
Why can't I accept an answer?
If you ever had a bounty set on it, and said bounty expired, you permanently lose the ability to select an answer afterward:
And probably several other examples ...
The checkmarks are images so something could be keeping them from loading. You could check if you have images disabled or maybe some ad blocking software giving a false positive.