Track switch won't switch

I have a small yard with 2 engine sheds. One switch refuses to switch. There is no AI involved. I have tried eliminating the switch and reinstalling, I have moved it further away from the shed, I tried adding another short section of track. Nothing works: it refuses to move. There are no consists on any tracks. Any ideas?

Does it show a switch stand/lever? Any yellow or red vertices?

The stand lever is there: it looks like every other switch being used.

Make a copy and then delete all the objects around the switch, including anything that shows up in wireframe mode. Maybe trainz does not pick up the fact that the mouse pointer is on the switch. Also try zooming out in Driver map and see if you can switch it. That's all for my ideas.