404 error when trying to edit images in admin

demetreas

for some reason I'm getting a 404 error when I click the image tab within the album edit area (in admin), or the edit image from the admin drop down on the front end of the site on any folder with more than 10 images in it? It works fine with any folder with less than 10 images in it which is very odd, does anyone have any idea as to how to solve this?