are settings or configuration specifics of printer on *nix system using cups stored in file? assumption yes, *nix systems seem use files opposed using registry system windows. if so, where such files located? capable of having file permissions modified, , if so, cause such thing occur in non-manual way?
this question relates one of other questions in helping explore single, individual theory toward answer there, decidedly separate.
check on /etc/cups, printers file printers.conf.
they can have permissions modified since belong lp group, not single user. check cron jobs, system updates , other cups interface distribution provides.
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