Rod,
Another thought:
YMRY Moruya is not in the OZx 3.0-3.4 package, but a special addon airfield (see ozx download page)
I think it draws from the OZx lib, beacuse when I switch it partially off via the utility, the objects disappear.
I have looked at the OZx scenery directory, and the YMRY files are in there:
I observed something strange. There are two files with the same name, onlly a pace difference:
kh_YMRY_CVX.bgl
kh_YMRY_CBX .bgl
Could it be that this means a conflict between thes two files and therefore the strange behaviour?
greetings,
Gert57