I see, thanks for the detailed info. It looks like DGIV is not happy if a Deltaglider is spawn during simulation, at least the video and the logs suggest this. Did you try to use the ScnEditor to spawn a Deltaglider with a DGIV scenario without OMP? Maybe it isn't even related to the later at all...
That said, I've found a small inconvenience with the mapping system: it is case-sensitive, while Orbiter's class loading mechanism is case-folding (due to NTFS, I guess). I.e.: if you do not match the casing in the location definition with the class naming in the redirect mapping, it will not work, because VESSEL::GetClassName() always returns the string it found in the scenario file, not the casing of the file it loaded (or the actual class name in the config file, for that matter!).
I've changed this for the next server and client version now, so it will always case-fold class names before matching them.
regards,
Face