Hello. I upgraded from Finale to Dorico Pro 5 around 3 weeks ago. I am using a desktop pc Windows 10 I bought in 2019. Some times when I close project in Dorico the Hub is not showing up. I have to restart the pc and recover selected projects and then save it over again. Any hints what the problem I can have? Thank you in advance. 
Sometimes rebuilding a new project image for the hub takes time in an old PC. Can you try to wait more?
Sometimes this may help:
Thank you for the tips. I will try it and see how it works.