Missing ground in snow valley

[Stravaganza]

Ok, but how do i determine what version of the game I've downloaded through Steam?
I would really like to know if it's already updated when downloaded from Steam.

Edit;

Here's five videos i just recorded moments ago.
http://www.youtube.com/watch?v=IeswsXAle2Y
http://www.youtube.com/watch?v=LZ0EcXNcZDQ
http://www.youtube.com/watch?v=uKc7nEjwSEE (MegaBoots)
http://www.youtube.com/watch?v=tGJn7lkXY7g
http://www.youtube.com/watch?v=M3ir4cjIusM