Today i was playing W:A on WormNET but after hosting a game i couldn't change the map. Rehosting the game didn't fix my problem. One player from Poland had the same problem. (i hosted games with HostingBuddy. Later i hosted one without it). When i started the game, all players were disconnected (it saw "due to desynchronization"). I tried it 4 times and all for nothing (again disconnected). Something is wrong with WormNET or with my W:A :/ this bug makes me unable to play games with other players. I'll try to host a game later. I'll say if it will still cause problems.

WormNET couldn't affect this, because it's basically just chat + a list of hosted games.

This seems to describe your problem (but not why would it appear spontaneously):
http://worms2d.info/Troubleshooting_FAQ#It_is_not_possible_to_generate _or_load_maps