The blocks you can build (track parts, deco...) are transparent and multiplied. I felt like looking threw the faceted eye of an insect.

Interestingly, the fix elements (in Stadium for example the grass, the stands, the roof, the flags) and the car are not affected. They appear sharp and clear.
I didn't change anything in the settings. And I checked my first suspicion, the spectroscopy, but it is off as it should. Oh, and no hardware changes at my side since the last time I played TM, no new graphic drivers.
Same in Canyon and Valley.
If it helps: As long as I am in map editor view, all is okay, but when I start driving (testing) the transparency and multiplying occurs. It's on new built tracks, on my old custom tracks and the official tracks as well.
I searched in the forum, but didn't find an entry someone else has experienced the same bug...