Moin Bakkels,
that indeed was the reason for having those 0kb files. If they are missing, the 'stock' RR files stay in place and do overlap with the modded version. Even if you are not bothered with the resulting graphical glitches, it might have an impact on your frame rate. In case the 3d object IDs are the same for stock and modded version, the duplicates will not show. If not, you might see objects twice or blurred, as you would if you are drunk.
Anyway, I´m going to see whether my time table allows for a typeIX patch. As you most certainly are not the only one to have that issue, others could be interested too.
Regards,
DD