NASLite Network Attached Storage

I had a fully functioning NASLite-M2 installation including UPNP media server. I tried installing a larger hard drive in the NAS box, but this in the end did not function reliably so I'm back to having just the original 2 hard drives. Somewhere along the way though NASLite-M2's UPNP function has been lost. Can still transfer files via FTP though.

On the Server Status html page it shows the UPNP and DAAP services are both enabled, and I've re-indexed the content as well as rebooted but still UPNP clients do not detect the NAS box as a media server. I've have tried re-indexing using either the generic, PS3 or DLNA compliance profiles. The clients I've tried are a Sony PS3 and a Nokia n810, which used to detect the NAS box just fine.

Any thoughts on how else to get this functionality back ? Is there an "indexing file" of some kind that I can try deleting, by booting the NAS box using a bootable Linux CD ?