Android stopped informing me about app permissions. Why? Since I upgraded to Marshmallow (Verizon LG-G4), I never get the little dialog that asks me to approve new permissions for applications I'm installing/updating, nor even the "no new permissions needed" notice. 

Is this a Marshmallow issue? Did I accidentally do something to turn those off? If so, how do I turn them back on? I can't find any settings that govern this.
Marshmallow comes with a new feature that asks for app permissions when opening the app. It has the new apple-esque asking for permissions feature. You can choose if an app can use these permissions or not.

If you want to change the permissions later, go to settings and search "Permissions"

If the app requires no permissions, it will not inform you of that. 
However, if it requested access to something, it will tell you.
For example, if I just installed Skype and started using the microphone, it will ask if the app can use the microphone. You can decline it or accept it.