It's a lot easier: the bridges are bundled into separate BGLs, which just need to be deactivated (change their name from .BGL to .OFF or similar) to remove them.
Thing is, OrbX has provided a tool for doing this. I have tried it and it works.
As proof, I could now also show a pic on which no bridges are visible. But that would just be silly, wouldn't it?
As the OP states, this didn't work for him.
For me, that's a sign his folders/files aren't anymore as OrbX installed and expects them.
Which means he manually applied changes, of which he's telling us nada.
The unusual black surfaces on the bridges were a first sign, the fact the Config Tool doesn't work proves it even more.
Case closed for me.
Wim