I just upgraded from PhotoPost Classifieds 3.11 to 4.03 and am still having a consistent problem in admin when editing a category or sorting a category. I had the same problem in 3.11.
After clicking the submit button, the progress bar begings to show action but after 10 - 30 seconds I get the internet explorer error page saying "Internet Explorer cannot display the webpage". However, the edit submitted did work and I think it is the "completed" page that is failing to load.
Is there a "memory parameter" that I can change to prevent this?
Doug Wilkinson Pictures of Cars