I decided to take the plunge into using S3 and W3TC, firstly it took a bit getting it set to work, using the Access and Secret Keys weren't working at first, I ended up having to access S3 via a ireFox plug-in and create an initial bucket, then W3 worked fine. But thats not my issue, the problem is I want to really just use S3 to host our images, I did the export of the media library and had no errors, re-cached the site and everything is loading perfectly, load times got cut in HALF!!!! But any posts that has thumbnails using wordpress gallery, or images that should expand via Light Box 2 I get an access denied. After searching the S3 bucket I found all the original image files never transferred, just the thumbnails that WP created. Am I going to have to painfully transfer all our original images??