So after the Season 3 patch this was a problem. My chat does not work while I'm spectating. When I press enter nothing pops up, and when my friends send me any messages it doesn't show up. I've checked like 3 times now, my Show-in-game ALL Chat option is on, so it can't be that O.o This is really frustrating because sometimes i would spectate a ranked game while waiting for my friends, and they'd just ditch me because i can't see their messages. Please help thanx

You have to hit the little 'eye thingy' in the UI (it's just to the left of the main middle ui that shows items/gold/etc and then you have to put a check in CHAT.