After installing Typo 5.1.2, I had some troubles with mail capabilities. My second problem came from the trackbacks. Typo should add a trackback link at the end of an article (see below "Use the following link to trackback"). However, this link was not added even if the "allow trackbacks" option was activated in Typo.After some more debugging, it simply appeared that this was due to the theme. I had downloaded a new theme (techblue) but this theme like others at typogarden are not updated for Typo 5.

A beginning of solution is to copy all files from themes/typographic/articles to themes/techblue/articles.

Another question I had is how to use Markdown or textile markups with Typo. I was using the default mode to write content but actually you need to be in source mode.