Not sure if this works on 7.1.0, but for 3.3.5a, open the GroupLoot.cs file:
On Line 53, remove the "."
It should now look like this:
string buttonNamePostfix = "GreedButton";
On Line 56, remove the "." and change "Need" to "Roll"
It should now look like this:
buttonNamePostfix = "RollButton";
This works great for me in 3.3.5a.