I'm encountering low quality pictures occasionally too, as well as other image weirdness, but can't figure out what's causing it. When I switch over to chrome they look normal again, but in internet explorer and firefox they still look strange. Are the low quality pictures you're encountering really blurry?
Feel free to increase the total possible winners to six. I accidentally entered a caption contest and won a free copy of the DLC, but I already have the DLC, so I'll contribute the extra to the wiki giveaway.