Printing as root does not change anything for CUPS. CUPS always runs its filters and backends as the system user "lp", for security reasons.
I have seen some warnings from the filters in your error_log which look like that perhaps one of the filters does not complete its work and so the subsequent filters get broken or incomplete data.
Printing as root does not change anything for CUPS. CUPS always runs its filters and backends as the system user "lp", for security reasons.
I have seen some warnings from the filters in your error_log which look like that perhaps one of the filters does not complete its work and so the subsequent filters get broken or incomplete data.