Hello,
With the following code, a part of draw is missing:
http://www.plantuml.com/plantuml/png/AyfFAYqkKL0Ao2zFBL8eBiyiISvGKaWiLW0B18FvN4N8YX2oN4Xg53AB5VpJqY12C8w30OQIF2u7RKCaLNa0
@startuml
robust "Power switch" as PowerSwitch
robust "Power" as Power
PowerSwitch is Off
Power is Off
@0
PowerSwitch is On
@+1
Power is On
@enduml
with this one a crask:
@startuml
robust "Power switch" as PowerSwitch
robust "Power" as Power
PowerSwitch is Off
@0
PowerSwitch is On
PowerSwitch -> Power@+1 : PowerOn
@enduml
Thanks