My character portrait does not display properly. Inside the circle is often a frozen piece of the game screen, most of the time containing the upper-left corner of the "real" portrait.
 
	The same problem occurs constantly with NPCs and Mobs as well, they either show nothing in the portrait circle, or the same weird piece of my character's portrait mentioned above.
 
	Sometimes when I equip an item, the portrait will be shown correctly for a while.
 
	Do you know what might be causing this issue?