Thank you for reporting this issue. I have attempted to reproduce this issue internally but have been unsuccessful so far. Have you tried to reproduce this in a later version of UE4? Would you able to provide your DXdiag and your project log files as well?
Any additional information would be greatly appreciated.
We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will offer further assistance.