building tunnels create sink holes

[NosajDraw]

I am returning to CS after a long break, and I am struggling badly with the interface, I'm finding things hard to find and counter intuitive, but the latest problem is that building a tunnel actually creates a vertical shaft going straight down seemingly indefinitely.

When I want to build a bridge it says "height too high".

I see there is new (to me at least) elevation control on the roads section, but although the graphic changes as I click on it, I can not see any actual difference it makes.

I'm using "page up" and "page down" to go up and down, as I swear they were the controls I used to use, but meh, who knows.

 

[NosajDraw]

OK scrap that, quitting and reloading has fixed the issue.

I'm left wondering if during my time away from the game if the DLC has introduced a bunch of bugs.

 

[metacritical]

it's more likely to be that your mods are not up to date. after every patch you need to make sure that any mods you use are compatible with the latest patch. the base code changes so mods need to be changed to continue to work with the base code.