List problem

I've had this list for the past 13 years: http://www.imdb.com/list/ls000043622/

When I try to edit it, it now often signs me out automatically. Which is fine, but I'm not able to access most of the pages in the edit function. I can see the first two pages and the very last one, but if I'm in edit mode and trying to go to page 4, for example, I just get "Sorry, there was an error loading this page."