So - For some time now I've been using the Space-Bar to bring up my shortcut menu, which I use all the time. (I honestly don't remember why I have it set that way but I've pretty much reset all the default shortcut keys to my own preferences and I'm used to them).
Now, in SW 2016 - when I select a sketch entity (while editing sketch), say a circle, the PropertyManager will automatically have the Radius of that circle highlighted. When I press space-bar (to summon my shortcut menu) - the menu does not appear and I have instead erased the radius. If I do the exact same thing in 2015 - when I select the circle, the Radius field in PM is still highlighted - BUT when I press the spacebar for my menu - the shortcut menu does appear and the radius field in PM is unchanged. Weird, huh?
I know I'm probably the only person who cares about this and I'll just have to change my shortcut key - but I'm wondering if there's a reason why this difference exists.