Mine shaft area doesn't load, and overview map gets locked

What happened is that the delve level failed to load, and then the overview map became kinda stuck, with a dotted line towards where I was supposed to go. Clicking on another node doesn't do anything.


1. I clicked on a node in the overview map, and the game started loading it, with the "loading" text in the top of the game window (with the current area still visible).
2. Noticed the ice golem was at half-life, so I hit the skill button to refresh him. This happened just fine, and I've done similar before.
3. But now the game failed to load the delve level. I went back to the overview map, and there is a dotted line towards the node I selected earlier.
4. Clicking on that node or other nodes also fails to get the game to load it up.
5. A little unsure on exact steps further, but I went somewhere else, to the hideout or a town, and then tried the delve location again later.
6. The dotted line was gone, and I could again select the node I intended to traverse.
7. Not sure if sulphite got wasted, but that is possible.