The theme setting is changed during the loading of the page after you hit submit. But that page has already started rendering at this point so it renders using the old theme. A great many things in the site work that way.

Work has already started to "fix" some instances so that changes get applied before the page starts rendering and to "fix" others so that you get told something like "Your change has been noted, please refresh to see the effect."

                - tye

In reply to Re: Changing themes in user settings strangeness (expected) by tye
in thread Changing themes in user settings strangeness by Joey The Saint

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