I've become so confused and frustrated by this problem, I've decided to ask here. I'm using the latest Eclipse, JDK 7u55, Forge 1065, (happens on 1059 too), and Minecraft 1.7.2. The project I've been working on suddenly started acting strangely yesterday. Seemingly at random, some classes in my main package would seem to stop existing to the other classes in the project, disconnecting all references to the class, making the entire project throw errors until I removed the class, refreshed the workspace, put it back in, and refreshed it again. All textures and the .lang file stopped working in-game too. As far as I know, it wasn't caused by anything I did, it was working fine when I closed Eclipse for the night, then when I opened the project the next morning it started doing all this. It gives the same in-game issues if I compile with MCP, and I've tried reinstalling Forge, updating Forge, re"installing" Eclipse with a fresh workspace, using the gradle commands to clean cache and redo setupDecompWorkspace and the Eclipse workspace setup...I'm out of ideas, and nobody I've talked to has a clue what could be going on. Thanks for any help you guys can give.
Project files: https://dl.dropboxusercontent.com/u/10036065/Foundry/%5BFoundry%5D%20Core%20Project.zip