For everyone, who found their Romm instance not working this morning:
Click "Edit" on the containter instance in the Docker section of Unraid
Click the toggle next to Basic View in top right to switch to Advanced View
Update the following:
Registry URL: https://hub.docker.com/r/rommapp/romm
Extra Parameters: -u 99:100
Make sure variables REDIS_HOST and REDIS_PORT are not in the list of template variables
Click "Add another Path, Port, Variable, Label or Device" and add a variable called UMASK with key UMASK and value 000
All these changes are related to the recent application updates. Or you can also wait until @Eurotimmy updates the template