Please provide skinparam shadowing false for all elements individually.
Example:
skinparam componentShadowing false skinparam rectangleShadowing false skinparam actorShadowing false skinparam databaseShadowing false
(--------)
Ok, with last beta https://dl.dropboxusercontent.com/u/13064071/plantuml.jar
You can have:
@startuml skinparam componentShadowing false skinparam rectangleShadowing false skinparam actorShadowing false skinparam databaseShadowing false actor actor component component rectangle rectangle database database @enduml
Is this what you are expecting ?Thanks