In 1949 he became co-producer and editor in chief of the party's bi-monthly news magazine, . Matejka had always taken a highly individualistic - some commentators prefer the adjectives "candid" and "unorthodox" - approach to his journalism, and that approach was on display in his many "Tagebuch" contributions. Circulation reached 10,000 copies by 1952, and peaked at 20,000. Keen both to build the readership and reduce the publication's financial dependency on the Austrian Communist Party, Matejka did what he could to extend circulation to neighbouring states that were still undergoing significant political turbulence, notably Hungary, Poland, Czechoslovakia and Romania. However, ethnic cleansing during the 1940s meant there was no longer a large population in those countries with mother-tongue German, while Soviet-backed governments, especially in Prague and Budapest, quickly came to identify "Tagebuch" as a "[western/imperialist] trojan horse". The Communist Party of Austria also came under pressure to discourage the sale of "Tagebuch" beyond Austria's borders. Distribution was hampered in "socialist" neighbouring states and then blocked. In February 1957 he was replaced as co-producer and editor in chief at , but he remained a member of the publication's "editorial college" till his retirement from it at the end of 1966.