i just logged on and i saw that i could not say anything in chat there were no mods on so i decided to come here its like ive been muted but i dont know what for if this is a mistake please fix and if its not can you tell me why ive been muted my ign is sjbooth423
You may not be muted. It's possible you entered commands only mode. Just go to your multiplayer chat settings and hit all.
Do you see a chat box itself? I had nearly the same problem few days ago (after 1.7.3 was released). I solved this issue by ajusting opacity in multiplayer settings.