I found an easier way to reproduce this: Instead of opening a full NX session one can simply do this:

1. nxagent +extension XFIXES -display :55
2. konsole -display :55
3. open xterm outside of the nxagent
4. then start copying/pasting data as described in the initial bug report

Wenn nxagent is started with -extension XFIXES instead copy/paste works.

Vorstandsvorsitzender/Chairman of the board of management: Gerd-Lothar Leonhart Vorstand/Board of Management: Dr. Bernd Finkbeiner, Michael Heinrichs, Dr. Arno Steitz Vorsitzender des Aufsichtsrats/ Chairman of the Supervisory Board: Philippe Miltin Sitz/Registered Office: Tuebingen Registergericht/Registration Court: Stuttgart Registernummer/Commercial Register No.: HRB 382196