Hey,
thanks :-), it did the trick indeed, I renamed to firstpos, secondpos, etc...
with all those libraries, creating namingconventions becomes critical, certainly when the editor adds more functionality.
I didn't even know frescobaldi adds this functionality with built-in lilypond code. I'm not a programmer, maybe I'm thinking wrong, or I don't grasp the concept yet, my last use of coding (php) has been about a year ago, but couldn't this be avoided by using a namespace, specific for the lilypond code used by frescobaldi?
grtz,
Bart