Okay so we have three servers hosting shares:

Staff
Student
Support (for us)

Folder redirection of my documents and appdata works fine from the support server.

However if redirected from the staff/student servers, it doesn't work. Setting their home directory to map to a drive works fine though.
All servers are 2008 and as far as I know, are set up identically.
I've set security the same on all servers. Why the hell is it only working on one server?!

No events are showing in event log either which isn't helpful.

I'm using a test OU with only the folder redirection policy applying.

I've checked firewall and file/print sharing is enabled on all servers.

What the..?!?