Willi Egger via ntg-context schrieb am 20.03.2022 um 17:05:
> Hoi Wolfgang,
>
> I tested both variants (bodymatter and bodypart. The compilation runs through, however without the thumb-picture in the margin and the metafun error is in the log.

1. Do you use \startfrontmatter and \startbodymatter in your document to 
create blocks?

2. Is you installation up-to-date?

Attached is a slightly modified version of your example, the only thing 
which has to be local to the bodypart is the background setting to 
enable the thumb pictures.

Wolfgang