I still don’t know what you mean with “default NAVDATA”.
To be honest, I don’t understand all the answers regarding the FMS arrival problems. Perhaps it’s a translation issue on my side. In this thread, several users report the same issue with arrivals at LIMC, VIJP, EGLL together with screenshot and informations about the STARs ans approaches they tried. For me, it looks like a systematic error.
Are the developers aware of that? Has anyone tried to replicate the problems by using the examples from this thread? Do u need further informations, examples or screenshots?