Issue when try to upload file on Eyecandy xfce-gnome

When i try to delete my “Product” i receive this error “You have no authorisation for this page”, only after 5-6 attempts i have delete (i have try also with chromium and same problem), when i have upload a file (i have upload only image) i receive forbidden request error, but only after many attempts, i have upload some images, (my english is not good)