There is currently only one reliable way, that I know of, to refresh the DLNA files. You have to fully power off the tv and turn it back on. When you press the power button, it does not fully power off. You can either unplug the tv(very inconvenient) or another way I have figured out, go in to settings>general>user agreements, remove the check marks and then hit accept(a bit less inconvenient). Your tv should tell you that it needs to reboot and it will then do a true restart. When you access your DLNA server, it will update the files.
