Hi. This is a hotfix to correct an issue introduced in last night's patch that caused some quest states to advance prematurely.
If you experienced this bug, your quest state should now be reverted to the correct point and you should be able to progress it normally. Unfortunately, if you picked up or received any items as a result of your quest state being improperly progressed, those items will still be in your inventory. If you received any keys in this manner, I would really suggest not using them until you have readvanced the relevant questlines to the appropriate point.
If anyone has any continued problems with quest progression, please let me know.