Graphical glitch on River Crossings

This happened i River Crossings. A few minutes later i was disconnected, and when i tried to reconnect the client crashed, which has never happened before on my computer.
After reopening the client, the game seems fine again, even in River Crossings :)
It is patch 0.9.11k
Screenshot and PC specs: http://imgur.com/a/P0hgW
Sorry for Danish PC specs.