The last 5 times I've started RR it's crashed, a couple times right at the start of proceedings and 3 times whilst navigating the menu's. The very last crash produced a crash dump file. Before you ask, brand new install of RR, on a different HDD, Win10 is up to date and it's the latest 466.47 nVidia drivers. If I verify the files 2 are missing and will be reacquired. Whether it does as it says is a different matter. So nearly given up, hanging by a thread.