It was a name close to yours but I got confused since the thread I replied to after the other thread was your other one so your name stuck in my head
Well if you get no thumbnail what error do you get? You have stated your data and uploads directories at every level down are 777 right well is safe mode on or off? If the issue is only you and not other users that would tend to tell me that your 1 directory under uploads is not 777.
Please post a url here and a test login for us to try and upload but that would just means it would work because you say its only you other users are fine. If you recheck permissions and thing they are right feel free to email support at photopost dot com and send me your url and admin login as well as ftp login.