Just a thought
You need to be very careful specifying the upload paths
Note the extract from the security file below
The word 'Gallery' is spelt 'Gallary' in the 4th line so you need to make sure you really are setting the right property and the right directory
<
securityname="ImageGalleryPath">~Uploads/Images</security><securityname="MediaGalleryPath">~/uploads</security><securityname="FlashGalleryPath">~/uploads</security><securityname="FilesGallaryPath">~/uploads</security>