Ohai, first post on the forum. been using IC² for a couple of weeks now, and I'm really happy with it, one of the best mods out there! 
But I found a bug (I think?) when playing on a friends private server. The painters seemed to be bugged. I painted some copper cables in different colors, and about half an hour later, all the paint had disappeared from the cables and also messed up the EU-transmission to my machines I had connected to them. They wouldn't simply transmit ANY EU to my machines. I fixed it by simply removing the cables and placing them again, but there's alot of loops and EU-losses since I can't paint them due to the bug.
Halp?
We are currently using IC² 1.15 on the server.