Sounds like you did the uninstall/reinstall of the HIPS extension by the documented procedures in the HIPS 8.0 Installation Guide. So I'm not sure why the (default?) HIP Dashboard would be failing.
Another more worrying issue since installing HIPS 8 is that the system which has it installed is unable to connect to the ePO server, am getting an error in the McAfee Agent Monitor saying:
Agent Subsystem > Agent failed to communicate with ePO Server.
I would open a McAfee Service Request with the ePO Support team to troubleshoot this. Can the system successfully ping/resolve the ePO server IP/DNS name? I have not seen a HIPS 8 install cause this issue. One circumstance where HIPS might cause the McAfee Agent to fail to communicate with ePO would be a HIP7 NDIS install failure, which might leave the system without network connectivity (but it would be more than just the Agent failing).
Am able to ping machine from ePO server and vice versa and NDIS driver seems to be ok. Is there a cost associated with logging service requests with McAfee?