Gambling around in the tutorial the following behaviour occured.
I tried to change the name of the index card as well as the content. If I typed a letter connected to the drop down lists in the top menu the menu was activated instead a letter being inserted. This behaviour occured independent of the type of window i typed in (corkboard, outliner, editor).
I attached a screencast of this behaviour.
This problem can be fixed by closing scrivener and reopen the project.
Best Regards,
Markus