App crashes and ntdll32.dll error appears in event viewer after adding a folder to the database.
This is due to a corrupt file that Roon is trying to index when building the database.
Go to AppData/Local/Roon/Logs and search for “corrupt”; it should be at the end of the last log file (Roon_log.txt). Delete the corrupt file from the folder referenced, restart Roon and the indexing will continue.