Help not working in vCOPs UI

Not a huge problem, but I get the following when selecting the question mark icon on any page;

HTTP Status 404 - /vcops-vsphere/vcops/help/en/

type Status report

message /vcops-vsphere/vcops/help/en/

description The requested resource (/vcops-vsphere/vcops/help/en/) is not available.

VMware vFabric tc Runtime 2.6.4.RELEASE/6.0.35.A.RELEASE

I have confirmed there is plenty of disk space by running; df -k

I have confirmed all services are running; vcops-admin status

This is Version 5.6.0, Build 923459 which was an in-place upgrade from 5.0

To be honest, not sure if help worked previously.

All other pages (custom, admin) load fine.

I have read a couple of other 404 posts about vCOPs, but none have helped.

Like I said, not a huge problem, but it would be nice to get contextual help time to time.

Thanks.