Update to Commerce shipping 2.x breaks site with WSOD
The 7.x-2 branch of Commerce Shipping is only in beta, it's not ready for production use yet (but you probably already know that). 

The release notes for the branch warn you not to install this on a site that currently uses v1.x of the shipping module:


  Note: If you are currently using Shipping 1.x on a live site, do not attempt an update on your live site. See the roadmap below for more information.


(emphasis theirs, not mine!)

I would heed that warning if I were you :)