Sync has not been changed in some time so I'm not sure what would cause this error. Please open a ticket and include UUID and we can run a remote diagnostic. Also include a zipped copy of the UDM backup file so I can investigate the blank page when pressing the home button.
The app now automatically shows the last selected (if you have multiple controllers) Controller's Devices and Scenes Folder. There is nothing else to show here as programs/vars/etc are now in the automations tab. If using multiple controllers they can now be switched via dropdown instead of backing out to the list of controllers.
The Controller's icon can be changed in the Controller Settings click the menu next to the controller name. Users can also add their own image via the URL option.
This should show a list of controllers, please include a zipped copy of the UDM backup in your ticket
Programs, Variables, and network resources are now in the Automations Tab. Feedback from users showed most usually open Devices and Scenes if not using Favorites, so this removes a few button clicks.
Aside from moving some Home tab items to the Automations Tab, most of the changes are settings moved into menus or dropdowns