I've noticed just lately that everytime I kill a bandit or something with a sword they get launched about 15 ft away from me.
Do you hit them with any type of shock or fire source beforehand? That is usually what causes it.
As for the naked courier, that's been happening since release, it's not so much a huge glitch, it's just the A.I failing to equip clothes when he spawns sometimes for some reason.
It has no relation to the 1.4 patch.