[bug?] Actor relative pitch rotation stuck in 90 degrees

I’m also having troubles rotating using UE 4.10.4. Pitch rotation stops around value of 90, this seems maximum value.


    void ARotatingActor::Tick( float DeltaTime )
    {
    	Super::Tick( DeltaTime );
    	FRotator Rotation = this->GetActorRotation();
    	Rotation.Pitch += 1;
    	this->SetActorRotation(Rotation);
    	UE_LOG(LogTemp, Warning, TEXT("Pitch: %f"), Rotation.Pitch);
    }

Is there a solution or maybe I’m handling rotation incorrect?