It looks like there's a bug with some versions (Mac at least, possibly also Linux, but PC one seems okay) where when trying to play online, the config file doesn't enter the IP address correctly, so it never manages to connect!
Let's say the IP address you entered is 123.456.789.10 and the Port is 11100. Unable to connect even though other people are? Look in the config file and the line "client_ip=" will have a garbled character for the first digit of the IP address! In this case it replaced it with a ^? (so it showed up as client_ip=^?23.456.789.10), meaning the client will not connect unless you manually edit the prefs file, correct the IP address to the server you're trying to connect to, and set the prefs file to read-only so the game doesn't overwrite it! It'll work once you do it this way, but changing the IP address in-game causes it to become garbled in the prefs file, which is where the client checks which IP to connect to when you click the Join button.
Another bug I noticed in 1.2.8. is that barbed wire disappears when you die in multiplayer, and respawn on the next stage. It still shows barbed wire in inventory, but you won't have the wire around your character, and won't do any damage to enemies, meaning it's gone. When you get another barbed wire, your inventory count is incremented by one, but the radius and damage are reset as though it's the first you've collected.
Last edited: Jul 20, 2015