Thanks for the help and pointing me towards permissions :C
NOTHING has been changed. Stupid thing.
(I think it's because my boss thinks it's particularly stable.
Not sure how true that is, but the thing doesn't seem to ever crash, though it's only acting as a file and web server, so nothing intense.)
Well it's not a symlink issue.
It seems like we can no longer share a cifs mount over samba.
/mnt/nmr is a cifs share off a novell server (I think), that require a login. It mounts fine, it just can't be accessed over samba. It's not just a Windows issue, the samba share can't be seen properly in Linux either.