Hello, I am having the same issue. Marshmallow 6.0 no longer shows the profile icons when you make/receive a call, even though it shows them in the Favorites or Contacts view. I added the profile pics using Outlook (I don't use Gmail as gmail is a garbage email client with an interface worse than Pegasus Mail in 1999, so don't tell me to sync to gmail because I'm not using that crap....like most professional people who need a real email client, I use Outlook/Exchange and ActiveSync to sync everything and store all contacts and email).
I have verified that when you add/delete profile pics from Outlook 2016, they sync to the phone within seconds. Yet they do not show up when making/receiving calls anymore!! WTF??
This has to be a bug with Marshmallow 6.0 on Samsung Galaxy S5 (Verizon). Please advise / fix ASAP!!