Not sure if it's the same thing you're experiencing, but I've been having a ton of trouble with turntables of late as well.
For some reason they will often "glitch" when loading a route, for no apparent reason.
This is one after simply loading the session for edit (route or session, doesn't mater). Note that the track objects (the blank boards) have flipped sides also.
Simply going into "driver" mode and selecting the turntable to rotate one position often makes it "snap" back to (almost) normal. Below is after doing just that; into "driver" mode, rotating the table one position, then back into "surveyor". Note that the track objects haven't been fixed though.
I usually find that the best thing to do is exit (
without saving anything) then re-load the route again (possibly also load a small simple route in-between to "kick-start" the cache?).
This is the same scene after simply exiting and re-loading.
This one is very common, with the table track itself showing as out of synch with the table mesh. Going into "driver" mode and rotating the table one position usually seems to fix this as the mesh "snaps" back into synch with the track.
These aren't the only issues I've been having either. Another one it will do during editing a route or session, seemingly (at random) if I select "undo" at some time, a table (not necessarily anywhere near where I am working) will appear as if it has "rotated" while all the attached tracks stay in place, creating a spiral effect of track splines, a bit like that string-art from the 70's.
Lately, when loading a route, I'll have to go around and check all the various turntables to see if any of them have "glitched" like this, before I start work, in case I have to exit and re-load the route. It's becoming very annoying.
[Edit]: Here are some more examples. They are all on the same route as those above, and these happened after a complete computer re-start and fresh load of the game and route. Nothing else done.
This one is an example of that spiral effect I mentioned (same route-load as the two above), but relatively subtle. I have seen it much worse than this.
And this is after doing the "driver", "rotate", "surveyor" technique I mentioned above.
Cheers,
Piere.