Its happening as I hit "render frame" instead of Lux popping up a few seconds later it just stays hung on the screen and nothing happens.  Sometimes lux will start but its happening often enough. Its the 1st time I run into this in the almost 1 year (coming on the 24th ) of using Reality... As I mentioned exporting only and starting from Lux seems to be a workaround but just pointing it out in case its a bug in the new version of Reality...