This issue is hard to explain but for whatever reason, the game sometimes doesn't "let go" of the screen when you alt-tab on my machine, this means that other windows and such I can interact with, but I am unable to see them, as Minecraft appears to be displaying over top of them.

It's completely inconsistent as well only happening sometimes when I alt-tab- and not other times- without any obvious reason.

I can confirm this happens with only this mod installed, along with the latest forge.

I'm not sure what workarounds could be possible for this, but- I figured I'd ask anyway.

I have seen this issue when like the internal server stops responding. While creating a custom pack I have an inconsistant issue where I will save and exit and get stuck at the dirt screen while waiting for it to return to the main menu. This normally means I need to tab over to task manager and kill the java process... but if I am in fullscreen, alt-tab does not release the minecraft window, I can use windows "blind" by pressing WINKEY-R, entering cmd and hitting enter. I now have a command prompt up but cannot see it. Then I can close java with TASKKILL all the while still looking at the dirt screen in minecraft.