I discovered this while trying to upvote an answer on the main website I upvoted a few months ago. I Kept getting the message "you already upvoted this answer...".
It seemed strange to me, because I know that if I upvote something the arrow should have a different color, so I tried again.
After 3-4 clicks I remembered I'm color blind. So that must be it.
Any chance the "selected" state of an up/down vote arrow can be changed?
Any other color blind people in here experiencing the same?