Thumbnail generator does not work

Since a few updates the thumbnail generator does not work anymore. It says nothing about this problem in the 0.15 discussion thread, and someone said it works fine for him. I did a reinstall with no mods and everything.
When i use the app and click on generate thumbnail, it goes into the photo room and does not keep the car i selected, instead it goes back to default car and nothing happens. it should cycle through the configs in small windowed mode, but nope!

 

Can confirm it works for me, too.

Custom thumbnails for the Piccolina don't match the vanilla ones for this vehicle (POV seems to be lower, see pic), but works fine otherwise.

 

I choose a car i want to make thumbnails of (no mods this time so no conflicts)
and click on the orange field


it goes into the studio and thats it, nothing happens, and it gets back to default car

And the same thing happens when i click on the orange field in the studio again.


i did a fresh reinstall yesterday, no mods are in currently

 

But what if i want a photo studio background on my pics like the stock configs have.

-side question-
The studio is currently dark and i have a white version in my mods and made a thread about how to make it white, but why did you guys didn't gave us a white studio in the first place, so every thumbnail for modders looks like the stock configs?
old example:

 

That worked, thanks

 

How to make it not cycle through all configuations, but only take one thumbnail of one configuation of the very car spawned

 

I'm not sure it's possible as of now, although it would certainly be a nice feature to have