It’s the first time in a long while we’ve received a report like this so we just wanted to make sure.
Could you check if these steps followed by @vicflo help you get rid of this issue?
Fixed it for anyone else that has this issue. Found in log that “Warning: Failed to load XAudio2 dll”. Simply reinstalling directx did not solve this issue as it didnt replace any dlls that were already existing.
I had to delete all Xaudio2*.dll files from system32 folder with the exception of the xaudio2_8 and 9.dll (make backups just in case and delete the ones in syswow as well if you run 32 bit game). Run the offline directx installer “directx_Jun2010_redist.exe” from the microsoft site to replace the files and it should work fine after that. This seems to be the fix for other UE4 and other games/apps that have this issue except this replaces all of them instead of trying to figure out which one was giving the error.