I have done 4 quests so far and all of them have had a the Quest info box empty. These quests include "The Lost horse"(twice), "The terrorized Village" and "The terrorized Merchant". After completing these quests the quest completion text cant be seen either.

On a side note, I didn't get a horse either Is the quest supposed to reward you with a horse Item? Or a riding horse? Or ?

Here is a sample pic of the empty quest box: http://screencast.com/t/ZjhkMjJkNTA

Edit: hmmmmm I dont know why but I cant reproduce the blank quest box anymore. The only thing I did was deselect Full Screen, but after checking it back on I still cant reproduce it.