Hi david ( :) ) we had the same exact problem on latest engine build this week. reverting back to older rc fixed it.Funny thing is on the FREE SDK that i had to download last week,they even forgot the rc folders in the Bin 64 and Bin 32 folders... lucky for me i had an older copy in my downloads ,adding both rc folders…
Fixed. In case anybody else gets this weird bug. My RC compiler was corrupt. Just replaced the RC folder under bin 64 with a co-workers. Fixed the problem.