Two CBS shows are delaying episodes that had been scheduled for Monday on Supergirl and NCIS: LA because going-on (bombings, "ISIS"-related stuff) might be deemed insensitive immediately after the Paris attacks.
I have mixed feelings, since to me the greatest thing you can do in the face of intimidation is go on as though it had never happened. But I'm lucky enough not to be directly affected by what happened in Paris, so I realized I may not be the right person to make this particular programming decision.
Anyway, in case there seem to be some continuity bobbles (on Supergirl at least), that might be why.
CBS Swaps Out Monday Episodes of Supergirl, NCIS: LA After Paris Attacks