Came here to say this. I also am not experiencing the 502 error but as GeorgeK said please post here if you are. Please also do not think that we've been ignoring this issue, it's just proven very difficult to track down what we think is the cause.
Basically the 502 error was completely misleading, it means "Bad Gateway", and nothing was wrong with the gateway! Sorry it took so long to fix
Seems to be sorted now Edit: Just to say that if anyone else comes across issues like this then feel free to drop me an email and I'll raise the issue with staff