The only front facing change to users is a check for missing data when attempting to load anything in the catalog. If missing data is detected, a message will pop up informing the user, with instructions on how to manually refresh the data. This is vastly preferred to the previous behavior of the app crashing.
The method of refreshing the data manually is going to Tools -> User Settings -> Force Database Refresh. This will force the app to download all the set data again. Only do this if you see the above message.
If you see any further issues, please don't hesitate to contact me through this site's contact page!