Well your uploads work fine http://feelthebass.co.uk/photopost/s...00&ppuser=1059
I would instead ask you to look at your php settings http://feelthebass.co.uk/phpinfo.php
You can not upload files larger than 2mb. Your using GD so you might be having memory problems on larger file uploads. Do you have mogrify on the server so you can try using ImageMagick to see if it helps?
Also if your file uploads are under 2mb but consistently they are over a certain size and nothing happens perhaps your host has the LimitBodyRequest variable set to a certain size.
In pp-inc.php try adding this in bold and see if it helps uploads if your going to continue using GD2
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