Ps3 Fails To Discover New Media Content On Whs

Hi.

I have a few PCs, WHS and a PS3 connected to my (wired) LAN. When using the PS3 and browsing the media server (whs2011) it fails to show recently added files. It consistently shows stuff that has been there for months but it fails to show files added within the last few days.

How can I force PS3 to rescan the folders? Or perhaps it's a WHS problem?

Thanks for any help.