My members are receiving the following error message when trying to upload: Unable to create image: [/usr/home/scrpdng/public_html/gallery/uploads/15/love_acrylic_book_page002.jpg]
It would appear your permissions are not set correct. FTP to your server and under your photopost directory make sure the data and uploads directories are set to 777 permissions at every level beneath those directories and you should be able to upload.
If the uploads/15 directory is 777 then the only issue I would think of is your path is wrong and your host is using simlinks so things dont break in that case make sure you correct your server paths in admin => global options and save or safe mode is on in php and in that case you need to get your host to turn off safe mode.