Thanks — I dug into this one hard. The good news first: the Orbis Weapon Store map itself is completely intact. Its layout, footholds, portals, the two shopkeeper NPCs and every single piece of its artwork are present and downloadable, so nothing is actually missing.

What's wrong is the loading. When you walk through a door the game blacks the screen out and holds it black until the destination is fully ready. The game normally pre-loads the maps you can reach from where you're standing, so doors feel instant — but it only pre-loads the first four, in the order the map file lists them. Orbis has seven exits, and the two shop doors are listed sixth and seventh. So they're the only two places in Orbis that get skipped entirely, and walking into one means downloading a 4 MB chunk of map data plus about 700 KB of shop artwork from scratch, all while you're staring at the black screen. On a slow connection that's easily long enough to look like a hang.

The fix is to sort the pre-load list so a town's own interiors (which always sit right next to the town's own id number) get warmed first instead of last. That covers the Department Store next door too, which would have had exactly the same problem.

If you do still get a permanently black screen after that change — one that never comes back even after a minute — please shout, because that would be a different bug and I'd want your browser console log to chase it.

Fixed and pushed.

The game pre-loads the maps behind a town's doors so a portal is instant, but it only does the nearest four and it was picking them in the order they happen to sit in the game data. A town's own interiors are numbered right next to it — Orbis is 200000000 and its weapon store is ...001, its department store ...002 — while its outdoor neighbours are thousands of numbers away. In data order those two shops sorted LAST of Orbis's seven doors and fell outside the limit of four.

So they were the only two doors in town the pre-load never covered, and walking into one meant downloading a 4 MB map file and about 720 KB of artwork from behind the black fade, which is held until the load finishes. Hence a black screen that seems to hang.

It now warms the nearest-numbered maps first, so a town's own doors are always covered.