So the rumor is that this will be fixed with version 1.2.0. The recommendation is for everyone to remain on 1.1.0 until it's fixed. Like all rumors, wait until it's confirmed but at least for me, none of the versions after 1.1.0 have worked.
Threadfin is currently broken after 1.1.0, and any version doesn't listen on the correct IP. As a result, nobody can reach the WebGUI option.
The current workaround is to edit the settings on the container. Under "Repository:" Change it from "fyb3roptik/threadfin:latest" to "fyb3roptik/threadfin:1.1.0". It will start working again, or work for the first time.