Your photopost does not exist here
http://www.yapky.com/photos/index.php
Now if I go here and I logged in with mambo I went to photopost here and uploaded a photo fine
http://www.yapky.com/mambo/photos/index.php
As I stated above your issue before was never cookies you had another domain name sneeking in there which was causing cookie to drop. If you still have links in your site to this domain your cookies will continue to drop
http://www.vkick.com/mambo
Cookies are domain specific
There is no issue here with our software.