Yes, another strange and fun little issue with FPS Creator. Some of my floors are disappearing. Well, not actually the floor, but the texture. I can still walk on the floor, but it and everything below it (other floors) are now transparent, down to the bottom of the skybox.
They show up correctly in the editor, but when testing or in a built game the textures are gone. Sometimes, if you move just right some of it will reappear for a moment. I've searched and found something similar with dynamic entities and shaders, but this is segments.
You can see the main level...

and the level below which is covered by the blue floor.

Then in test mode or built game they are all invisible.
Any thoughts?
EDIT: More info...
It happens when I try to lower the floor. Default for floors is
offy0=-50. If I set the floor at
offy0=-60 then it happens. I tried to go from the lower floor up with
offy0=40 but got the same result.