BP_PlayerCharacter SetActorRotation strong jitter

Hi everybody,

looks like my SetActorRotation is broken. For example the standard UE4.2 “Content Examples”.Demo.
When I open the “PlayerCharacter” BluePrint and add the following:

key “T” → SetActorRotation(X:0 Y:90 Z:0 )

compile->save->play->press “T”

Then the screen starts to jitter very strong.
No playing possible, I need to stop the game.

Tried it with different projects.
Is it only in my UE4? Is this a bug?
Shoudldn’t I use this command with a character BP?
Is there another way to set the player look direction instant into one direction?

Thanks for reading!

UE 4.2