Using the latest W3TC version, 0.9.2.8, I'm getting the "Source not found" error for every one of my custom file exports for my CDN (Rackspace Cloud Files), using a CNAME/subdomain to hide the ugly URL.
All of the paths listed appear to be relative to the site address (rather than the WP address), which is at least one of the issues. All the other categories of file to upload are correctly detecting the path.
Other than the custom file paths missing the prefixing "cms/" (which is where my WP install is located), the paths are correct and I have spot checked that they all contain the file that they should.
I've got another WP instance up and running with W3TC on another cloud site so I'm at a loss as to what could be the issue since they should be both configured the same other than the domain.
The only difference is that the first instance is using XCache for everything and the second is using Disk (for some reason, XCache threw a ton of errors on the second instance and I didn't care enough to try and get that working).
Any suggestions on how to debug this?