Bethesda Admits Skyrim Patch Was "Too Aggressive"

Among other things, the update will fix issues like magic resistance not calculating properly and the rare, amazing backwards flying dragon.

...After the holidays, we’ll continue to release regular updates for the game — through full title updates, as well as incremental “gameplay updates” to fix whatever issues come up along with rebalancing portions of the game for difficulty or exploits.

We’ll continue to do everything we can to make the game better and better for as many people as possible every day. We’ve also realized that with the millions upon millions of people playing Skyrim, we need to treat our updates with greater care. If we get too aggressive trying to fix a minor issue, we run a risk of breaking something larger in a game like this. To be safe, we are prioritizing code side fixes right now over data fixes. Quest and balance issues are usually data, and those will start rolling in a large way with the January updates.