About half of the time, my little character's body/armour isn't showing properly - it is showing as the shape of the body/armour, but just in a solid cream or brown colour. Enemies are also showing in this way some of the time, and the little snaily guys who sell you things in the haven are too! I took a screenie to show what it looks like:
http://wiki.spiralknights.com/File:Custard_cube_bug.png
~Ad =)
Others have had this problem, see here: my thread
You graphics card driver is the problem; you need to update it with a newer, or perhaps more likely, an older version.