Surely enough, the slot on the G string hadn't been cut wide enough, a quick modification with a small file and the problem was solved! I tried all the other strings and the D string also needed widening slightly.
Not very good to have to do this on such an expensive bass!
This has led me to wonder whether the grooves in the nut have been made deep enough as well, as the strings seem quite high at the nut, can anyone advise on whether there is a specific measurement for this?
