This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
Mouse appears outside of viewport window when cursor is dragged off of editor window while UDK is open. This occurs even if UDk is minimized.
Note: Cursor will appear outside of editor window but all functionality remains in viewport.
1. Open UDK, minimize UDk.
2. Open UE4 Editor (any project)
3. Press PIE.
4. Drag mouse until cursor should be out of editor (drag to second screen if available).
Head over to the existing Questions & Answers thread and let us know what's up.