[NSC] Screen stuck in "Night Mode"?

[Gilliver's Travels]

Suddenly, all NSC pages are showing white text on a black background.
All other websites are normal... Anyone else had this? How to fix?

HOLD THE FRONT PAGE: Problem solved!!

Just discovered in Your Account / Preferences there's a Style option - Light or Dark. Mine had somehow been switched to Dark.
Chose NSC Light / Save…
and all is now OK!