Hi wori, newer versions of the node editor work ok on the v5 beta, I think the one you have there is old.

Try Nodeeditor 1.1 jms from:
https://moi3d.com/forum/index.php?webtag=MOI&msg=9358.1

There are links to some other versions too I think at https://moi3d.com/wiki/nodeeditor .

- Michael