Leo,
That file, working with 4.6 would be interesting to examine. I suspect
seeing what the 4.12 doesn't like will be very telling. It is quite possible
that there are somethings in there that will require manual intervention to
cure. While we've tried to leave a path forward for the files to convert
automatically, maybe there is something missed.
-Ken Cameron, Member JMRI Dev Team
www.jmri.org
www.fingerlakeslivesteamers.org
www.cnymod.org
www.syracusemodelrr.org
Ken Cameron