Just for the record: The workaround described on the associated discussion on the development list https://lists.berlios.de/pipermail/x2go-dev/2013-June/005792.html works for me:
mv /usr/libexec/x2go/* /usr/lib64/x2go rm -Rf /usr/libexec/x2go ln -s /usr/lib64/x2go /usr/libexec/x2go service x2gocleansessions start chkconfig x2gocleansessions on
Obviously it would be good that the rpm packages would be fixed.