I've pushed the green up arrow multiple times, but to no affect.
Are they just decoration?
I've noticed this as well.
Having said that, about 1 in 25 tries seems to work.
I'm no interwebz tech geek, but I wonder if packets are misdirecting/dying? I've seen in the past here where if the server was laggy it would, with some regularity, fail to work. Sometimes it would "be done" a few minutes later, but would also just never register (until I hit it again).