Hi Matthias,
You are not waiting for any interaction after your trial’s last command (.log()) so it moves on to the next trial before the participant can see anything. Simply stack .wait() below that .log() command and you will have ample time to read the question and press a key before your experiment moves on to the next trial 🙂
Note however that your Text elements AnswerL/AsnwerR’s .print() commands are not executed in the scope of selector.add: that’s a bug, which I should fix, but anyway, you can move those .print() commands onto the newText commands. Note also that the Selector element simply makes elements “selectable,” it does not control their position on the page (except, marginally, through the shuffle command). If you want your two Text elements to be displayed on the same line, you can either use the after/before commands, or place them on a Canvas element (or pass coordinates to their print commands to position them relatively to the page, but in your case you probably want them to be printed below the preceding Text element “Question,” wherever that one ends up on the page)
Jeremy