Many of you have noticed that there are new routes in the workshop available for subscription. Something that wasn't clearly mentioned before is that the routes work in the beta test version only! Trying to use them in the current version will crash the game when you try to open any of the (old) routes.
If the game crashes upon opening a route you can fix it either by:
1) unsubscribing from the routes in the workshop, or,
2) downloading the new beta test version by opening your Steam client and right-clicking on the game, then selecting Properties from the pop-up menu. From the properties window go to the Betas tab and choose the beta from the drop-down menu (no password required).
Apologies for the inconvenience!