FML world loading issues. [fml 1.8 1016]

[Darkhax]

I was loading up my world files in an attempt to find more info on the concurrent modification exception that we have all been having. After loading and unloading a world successfully a few times, I will get sent to the main menu and an exception is thrown. When another world is loaded the entire program will just freeze with no further information being recorded. This issue does not seem to be present in vanilla or the deobfuscated mcp environment. This is the log generated. There seems to be a few different things going on here. Hopefully this will help you track down the source of some critical issues.