Builderb0y, I guess it's MCPC+ with plugin for multiple dimensions. It's known bug. I use IC2 API for syncing data to client and IC2 API implementation had this problem. As far as I remember it was fixed in either MCPC+ or IC2, but I don't remember exact versions.
Well I'm not using MCPC+ on singleplayer… So you're saying I need to update IC2 to fix the issue? Because gregtech specifically requests that you use 1.116.377-lf. I guess I can give it a try at least. I'll edit this once I've tested it.
EDIT: Tested it. Didn't work. Machines still look bugged after reloading the world. And gregtech is complaining. Every time I load a world, I get: "This Version of Industrialcraft is causing serious Problems with the Electricity Network. Downgrade to Industrialcraft Version 1.116.377-lf, to fix these Problems." in the chat window.
Is there anything else I can try? Or am I just going to have to deal with my power plant having a broken sign?