FastDL downloading but models/textures still showing as errors?

Bought a new server yesterday and started plugging away at adding addons etc.
Managed to get FastDL downloading files to clients (Shows up in the loading screen as downloading files)
When they get into the server the models and textures are still showing up as errors. Any ideas how to fix this?

I have a lua file pushing the files to clients and that works - The files seem to download but still appear as missing.