Are you 100% sure you're starting it as the thread states? Just double-checking as 90% of the reports is being caused by them not following the instructions for 100%
If the GUI is not properly visible for you, please minimize it once so you'll force it to re-load itself. You're entering the word Lobster in the wrong textfield that's what's giving issues.
I've been hearing that there are some issues due to the new update. Please try again in like half a week. If the issues still persist by then we'll take a look into it together
Did you start it exactly as the thread tells you to? I'm aware that the oak dungeon doors aren't as efficient as they should be but they should work if you start it as the thread states