Karma is now shown with posts in prosilver, but I had to work around several bugs: 1) the template event file may not be placed in a subdirectory as https://github.com/nickvergessen/howto-convert-phpbb30mod-to-phpbb31ext suggests, but must be in the styles/[style]/template directory (regression caused by the introduction of twig); 2) until pull request #1564 is merged, adding a suffix of _loop_element to every BEGIN loop variable in every template event file is needed to make it work.