I've turned off showing IP address at the footer for some time and had it turned on couple days ago to find out it only displays 0.0.0.0. So I've turned it off until problem gets resolved.

I also get 0.0.0.0 on who's online under Admin/Tools.

What would cause $ip = $_SERVER['REMOTE_ADDR'] to get only 0.0.0.0?

If you must ask what contributions I've installed, there are about 50 of them (pretty much everything from the download section). They all work fine and most of them use overrides and I don't remember touching display ip section. (I can almost guarantee particular code hasn't been touched).

Again, what would have caused $ip = $_SERVER['REMOTE_ADDR'] not to obtatin proper client IP??