[Arras Theme] Archive Quick Preview Layout Thumbnails Not Displaying

Hi ??

I’m trying to use the “quick preview” layout for my category/seach archives on the Arras theme, but the thumbnails aren’t displaying, just black rectangles where they should be. The posts all have thumbs attributed to them, and are displaying on the front page in node format and on the single post pages just fine.

I tried doing the recursive 755 permissions on wp-content thing I’ve read about, but that makes my site display completely without any theme at all! When I change it back to what it’s currently at, poof! Site is back.

Anyone know what the problem could be?