I also switched from experimental to official build, but still didn't receive any update regarding the final release build 1.0 !
I even tried to verify the files via steam, but nothing. The game shows 59783 build version.
I have the same problem, but I can't even start any type of new game!
I literally can't play! I'm on latest experimental build, I also tried the verifying option in steam but it seems that it did nothing.