After making the switch to the subscription I had a good week of use but now have this 'glitch'. After editing say 5-10 photos and doing some exports the Develop Modules goes blank. This is of concern if I am to rely on on a program. The current solution is to log off the current user (not reboot) and I am back in business for the next 5-? images. Hardly a long term solution. I may try the Adobe Creative Cloud Cleaner next.