I cant modify a URL under "manage sef"

Steps I took:

filter for "category-page" and click edit for the SEF URL for that category blog layout page

Add the title "My Category Page is gear" and hit save

it goes to a blank ../administrator/index2.php..

nothing happens...I got back to admin | artio | manage sef and with the same filter and edit nothing was saved for this URL

Help?

I am using Artio Joomsef version 3.5.3 on Joomla 1.5.12

Hello,

This problem was caused by an upgrade from 3.5.1 to 3.5.2 version. Please, upgrade your JoomSEF to the newest 3.5.4 version, it has been fixed there.

Best regards,
ARTIO Support Team

I have the same error with the new version 3.5.4 without having any previous versions.