Long story short: I'm nesting the Ring Progress Bar in a RelativeLayout that is nested in a LinearLayout that is nested in a ScrollView. When I go from just a LinearLayout on the top level to having everything within a ScrollView, the ring will disappear.
Nvm found a workarround. For those that are having the same problem: hardcoding the android:layout_height to a specific dp value should solve the problem
Long story short: I'm nesting the Ring Progress Bar in a RelativeLayout that is nested in a LinearLayout that is nested in a ScrollView. When I go from just a LinearLayout on the top level to having everything within a ScrollView, the ring will disappear.