HI General,
Sorry about the mix up in the response that I have provided. What was meant from that question was to find out whether you were running UE4 from binary or from source? Also, Are you using the student version of UE4 or the paid version? The answers to this question will provide more information on the issue that you are seeing.
I can only assume, from the information above, that you are using the Github version of the launcher. Is this correct?
Your Dxdiag can be found by select the Windows Start button on your search and searching from Dxdiag. From there you should be able to find your Dxdiag.
There are packaging fixes in every new version of UE4 so that would be the reason to check and see if the issue is still occurring in 4.5.1.
I am going to look through your log files and see if there is any information that can help you with your issue.
Again, Sorry for the mix up.
Thanks!
-Sean G