Ever since I read a post on the board related to this error "request entity too large" today, I am randomly getting this error.
Mostly what I am trying to do is look at a post or my profile. I am not getting it on any other site. Nothing I am doing is too large. I have cleared my cache and history as suggested in an earlier response and it is not fixing the problem. I do not think my request is at all the problem.
It might be with the servers for the site. See one note I found below.