[Plugin: W3 Total Cache] Unresolved file transfer queue message persists

I’ve emptied the queue, but I am still getting the message in the dash. Caching is still working well and the site screams, I just am wondering if this might indicate a greater problem with my configuration.

I don’t know if it matters, but I am using the same wp-content directory and database for my development installation, which has multisite enabled, but not domain mapping. This uses a different table prefix.