I can play online no problem with other players when they use random generated maps however when they use a custom map like a shoppa or roper the game opens a random map for me and tells me that all the other players dropped due to de-synchronisation.

anyone have any ideas? i installed the latest patch, i'm on windows 7.

when i'm in the lobby i cant see custom maps in the preview either. it always shows the same map.

It's most likely this: http://worms2d.info/Troubleshooting_FAQ#It.27s_not_possible_to_play_on _colour_maps_online

Let us know if you get it sorted.