You can now save your changes, and change the size of the board if you're using the new board layout (activated by changing "boardprefs" in your profile to "Enhanced").
Still a couple of bugs. The type of pieces you choose is saved, but the viewgame page always show Set2. And changing the size to anything smaller than "Normal" won't show up correctly on the viewgame page.
If you come across any other bugs, let me know. After a couple of more weeks in "test" mode, I'll switch this UI to be the default one for browsers that support it.