I'm using WP 3.1.3 with WPFolio 1.72. I'm having problems with any arrow (next and previous posts, any "next") and the link "Edit this" (when I'm logged in) are with a question mark instead of the arrow.
As I wanted to get rid of the arrows for previous/next post, I've edited single.php and index.php and deleted the references to previous_post and it seems to be working (as at the bottom of this post).
But I'm still seeing a question mark with "Edit this" and under any category or tag view.
Any suggestion on how to solve this?