Just a thought - but one of the early symptoms of the internal SSD in my MacBook Pro going bad was certain software not working just as you describe. Don’t know if your Mac has an SSD or how old it is, but it might be worth running the Disk Utility and see if there are any errors?
Let’s hope not - but it should be under warranty if so. Alternatively, have you loaded any other software recently that might have messed up some of thelibraries Lightburn uses? Or deleted anything from your system area?