"You might have ran out of VP for the day. Wait a bit or check the power on "
It's strange though, I always check on steemd. Sometimes I upvote someone and it gives zero, a few minutes later and for another person it gives .10.
I annoyed my teachers as well!! hahaa never repeated a year, but every year on exam. Only god knows how I graduated as an engineer. Guess one day I had to grow and study.
Because the voting power increases from 0 to full. So of course that after you give zero and wait a little more you give 0.01 ( i think its 0.01 since if you give .10 that will be an error :) )