It looks like you are using an outside app to view the site vs just going to the site directly.. the app is where the change has occured, the website looks the same as it always has.
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I've had green forever; it's blue when I'm not logged in.
I didn't change a damn thing.
I was using google to search for some historical stuff on here, and one page loaded this way, and then everything else has been.
I suppose I ended up with a cookie that says "use green", although I don't know why google populated one result that had this, and 150 that had the normal grey/black theme...
The color change, coupled with the change of the logo and VB change, made me think site maintenance had caused this.
Off to click all the damn things to go back to normal...
Apparently you only have to click one thing...
Back to normal, with the original logo and such.
Stupid ass google changing my preferences through search results.
You should feel virtuous being so green and all. What's next? A Prius?
Change your theme, change your life.