Hi Marc,
I'm working up last week's mails; here's finally some feedback ;)
I looked at the metadata in http://files.basex.org/maven/com/ettrema/milton-api/maven-metadata.xml
I simply deleted those files, as I think they have been a relict from previous installations, and I updated the 1.8.1.4 files. Are the problems now solved?
Hope this helps, Christian