Originally posted by Chilli con Carno:

Try to restart the game. If this doesn´t work the server might need a restart in case it´s a dedicated server

Originally posted by N0ma13:

Originally posted by Ominous:

Semi-necroing this topic - I cannot repair anything anymore when i play multiplayer, but it works in SP. Anyone else have this problem?

Sounds like a desync issue. Betting you can't damage enemies when you can't repair.