Running latest WP and W3TC.
The plugin, when asked to create a container, defaults to creating the container in Dallas. RS Cloud Files has a Dallas and Chicago location now. Manually creating the container in Chicago in the RS control panel is fine, but it appears that the plugin only looks for the hostname in the Dallas DC, not Chicago.
I've used W3TC many times on other sites and have now tested this on 3 individual WP sites on two RS accounts.
Any ideas? Anyone else have this problem? Or tried it?