In 1.7.7a, two of the images in the player folder are png formatted (Player 3 Male Face and Player 4 Male Small). Some images are also missing dashes (some of them have, for example, Male Face instead of Male-Face, whilst all the other do have it), which is causing a few more hiccups where the code is looking for images with the incorrect names. Basically, a load of the player images don't work because of inconsistent naming schemes or formatting.