Blank branches cropping up all over?

I got a yen to go back through some of my favorite StoryNexus worlds, and it appears that a number of branches associated with area transitions have stopped working – going to the surface in Below, buying sim access in The Annwn Simulation, exiting the East Wall in Locked Code, all of which are branches that must be played to progress very far.

I’ve tried Firefox, Chrome, and IE with no success.

Is there anything to be done at this point, or with StoryNexus on bare-bones life support should I just regretfully wish these worlds goodbye?