Hi folks.
I have skipped a couple of updates (rolled back both 2016-11 and 2016-12 due to issues with my particular setup) but have updated to 2017-01. I Have always had a custom shortcut key bound to lock/unlock current screenset, however it does not seem to be an option in this update. Am I missing something or has it been removed? 
 
Thanks for your help:)

The entire set of keyboard shortcuts in the Views | Screenset section have been missing since the [2016.10] release.  See http://forum.cakewalk.com/FindPost/3556467.
 
Hope this helps,
-- Ron

Thanks Ron - missed that.