The resolution of the picture sent, (600x800), and the resolution of picture posted, are drastically different?
When I click on the thumbnail for your image I see a 599 x 799 picture - looks right to me?
Regarding the login issue... If you are seeing that "all cookies cleared" message I suspect you are logging out (by clicking the log out link). That link clears your cookies so you will have to login again. TO void this, log in and click the remember me button, then when you are ready to leave the site just close the browser window. The server will disconnect you but your computer will retain the cookies that keep you logged in. Next time you come back to the site you should not have to log in again.