Hi,
I think there is a small bug with the ActivityDiamondFont* params and the repeat arrow.
Exemple :
@startuml
skinparam ActivityDiamondFontSize 8
skinparam ActivityDiamondFontColor #ff0000
start
repeat
:Eat Hot Wings;
repeat while (Still Hungry?) -> yes
-> no;
stop
@enduml
I think the "yes" should be like the "no".