Windows 7: Music doesn't add to Media Center via extender

Hi,

I've recently had to change my music directory, now I can't add the new location to media center via an extender.



On my PC all the folders have been corrected to the new music location, WMP and Media Center on the PC pickup the new folder fine - however via the 360 media centre no music is present. Manually adding the correct folder doesn't do anything.

*However* if I set a USB drive to the drive letter of the old music location, music is picked up fine and all is well - until I remove the USB drive when it vanishes again.

I've already deleted my WMP library files, removed the references to the old location in the registry.

Any ideas?