Silk is probably out of sync with Seras. Since Silk is in the test mode, I have to manually (GASP! manually!) tell the servers to synchronize with each other so that the files match. If you're seeing a File Not Found error then that file hasn't been synced yet. New episodes are prone to this sort of error on Silk.
Everything's looking good so far and it looks like everything will be running on Silk soon. Maybe next month, we can have another Silk server if our revenue allows for it.