Fixed TargetedTriggerAction 

Fixed incorrect DependencyProperty initialization in TargetedTriggerAction which causes InvalidCastException

jlaanstra, do you use ReSharper or something similar?
You deleted "null, " from new PropertyMetadata(null, new PropertyChangedCallback(TargetedTriggerAction.OnTargetObjectChanged)));
So default value becomes of type PropertyChangedCallback on TargetObjectProperty and TargetNameProperty on TargetedTriggerAction type.

Please, apply and update NuGet package as soon as possible. It is critical issue!