Diablo II: Lord of Destruction, please help?

I've already played through single player once and I'm trying to go through it again in Nightmare difficulty.

I got to Act 2 to the part where you kill Radamant to get the Book of Skill and finish the first quest. In the glowing chest in his lair there is supposed to be a Horadric Scroll which you take to Deckard Cain for the next quest except the chest never dropped a Horadric Scroll.

I have the latest update (v 1.12) and last time I did this quest in Normal Difficulty I did get a scroll, so why isn't it showing up this time??

I've tried saving and exiting, going back, and killing Radamant again to see if the scroll would appear another time but still nothing.

Is there anyway I can get the Horadric Scroll or how do I fix it so it will drop from the chest?