3D hardware mode stops working after december update

After december update, 3D frame packing seems to stop working. When I choose hardware mode in 3D, it just show 3D in top-bottom mode.
Used to work normally before the update.

Can you please upload some logs so we can check this?

(FWIW 3D MVC video is playing out to my plasmas in Full HD ok still.)

Indeed. Can’t think of anything that would introduce such a regression. Logs should help us see the issue.