No, I definitely only made a new FZR skin, pitted out with it right away (no setup changes or anything), pitted back in after a few seconds to check on my fuel before the race started; and that's when the skin changed.
There's no doubt that it was at the end of a qualifying session, at Blackwood, and maybe (it's how I pictured it when I first recalled it, to post here) in the evening weather.
Now this I'm not sure about anymore, but I remember bits of the picture: it selected one of the default blank skins with the yellow swatch at the top of the left hand side colors settings column.
And it had happened once before, although I can't remember anything about that occurence other than it happened at KyotoGP in daylight weather, and that I made a note to go post it in here.
I'll keep an eye out for it and report anything new.