CUPS problem solved

Today I had to resusitate my macbook today after I have written into /etc/authorization... This was because I tried the things discussed here: https://discussions.apple.com/thread/2374598?start=0&tstart=0 (socc123her's contributions)
My problem was somehow similar to this here.

Finally I tried the following from macadmincorner: I edited /etc/cups/cupsd.conf in the terminal using emacs.

sudo emacs /etc/cups/cupsd.conf

There I changed the file so that this

# All administration operations require an administrator to authenticate...
  
    AuthType Default
    Require user @SYSTEM
    Order deny,allow

was changed into

# All administration operations require an administrator to authenticate...
  
    AuthType Default
    Require user @SYSTEM @lpadmin
    Order deny,allow

and

  # All printer operations require a printer operator to authenticate...
  
    AuthType Default
    Require user @AUTHKEY(system.print.admin) @admin @lpadmin
    Order deny,allow
  

was changed the same way, that "Require user" now includes "@lpadmin".