Well… maybe we start getting to the root of the problem.
CUPS recognizes the printer and is able to print test pages on it. Unfortunatly any other program hangs up as soon as i choose to print something.
e.g. Acrobat reader works perfectly fine until i press “Print”. At that very moment it stops working. It does not crash with an exit. It is just stopping to work, like “freezing” (but only the program not the OS).
MAybe this description helps a little bit more. For me it seems as if something with the printer-service communication is corrupted. something between the System itself and Cups on the other side.