I've been having this same problem.
Ever since I first tried to upload my Rinoa photos I've had some strange error codes on that particular costume page. This was way back...4 or 5 months ago when I was updating my ACP page.
Here is the link: http://www.acparadise.com/acp/display.php?c=30749
I tried to delete the pictures and upload new ones, only jpegs and it did the same thing. Earlier today it looked normal, so I assumed the bug was fixed, but a friend alerted me that it was buggy and strange.
The bug code is this: [phpBB Debug] PHP Notice: in file /home/acparadi/public_html/func2/templates/display.php on line 373: filemtime() [function.filemtime]: stat failed for ../cosplayers/56806/56806-30749-57b4c217e6fdcde672ea3fa20518649d.jpg
Any way you can fix that? =)