Switching shards doesn't update all UI elements properly

[wtfrank]

1. view a highway portal room on shard2
2. click a portal to shard1 and view the linked room.
3. mouse-over a room on the minimap (minimap is correctly rendering shard1 rooms)
4. observe that the link to the room on the minimap goes to a room on shard2, not shard1.

This screenshot shows in the top right that we're viewing a room on shard1, the bottom left room in the minimap is moused-over, and you can you see in the bottom left of the screenshot that a shard2 room is linked, not a shard1 room, even though the minimap is rendering the correct shard1 rooms.