Unreal Engine 4.8 Preview

There may be a bug in UE 4.8 Preview. My driving game uses three Scene Capture 2D actors as rear-view mirrors (left side, center, right side). “mirrors” work fine in UE 4.7. One of mirrors shows view from interior camera in UE 4.8. Since playing a game within UE4 Editor seize control of mouse, I can’t take screenshots using Windows Snipping Tool. How do I take screenshots? Do I need third-party program? How do I fix mirror problem?