Custom approaches and user created waypoints for a user created airport now causing CTD since SU6

I have created a fictional airport with custom ILS and associated approach, useable in the FMS of various AP systems in the sim.

Everything was working fine prior to SU6. Now, any attempt to load the approach from either the World Map planning screen or by programming the FMS avionics causes an immediate crash to desktop.

The approach still loads correctly into LittleNavMap.

I have filed a ticket with zendesk. I am posting this here in case other developers have witnessed the same issue.