I had the same problem as many other friends that they couldnt report an feeder or such ppl who just rage n do noth cuase they did report me or us first, i have PC, so i dont think its a MAC problem its a bug or such that wont let u reprot some1 who has reported you first, i think riot should check that because its something that usually happens.
And btw its annoying to get reported if u didnt do anymistakes... ppl who are innocent should be in tribunal... its just unfair, even more if the ones who fed rage or quit couldnt be reported...
PD i dont speak much english but if i didnt make my self clear just tell me plz.

People who are innocent should be in the Tribunal. That's what it's made for - to find them. What you mean is that they shouldn't be reported, but then again the person reporting shouldn't be disobeying the Summoner's Code either.

well then when some1 reports an innocent player should get his ass in tribunal so ppl wouldnt just reprot other players for nothing... that would make easier for riot and for us too.. its just unfair... anyone can report anyone for nothing and go on doing it every time plus the idea that they may not get reproted back cuase of the bug...