Im having the same issue. I can open LRC on my laptop. When I select an image and go to Develop, any preset I select the program freezes. This began occurring after I did the upgrade to 10.1. I am using Windows 10. I use an external hard drive for my downloads and storage. My laptop is less than a year old and Ive never had an issue with LRC running like this until the upgrade. Any help would be appreciated.