thank you for looking at this. helps to have fresh eyes. i haven't done anything different. filled in all the paths, ports, etc. the problem arises with The Calibre Welcome Wizard, after successfully logging into guac. when i change the container library path from "/config" to "/books" the database either just plain fails or is corrupted. if i choose repair, it doesn't work. but if i choose the default "/config" then it works.