The bug that has dogged some people with previous versions is still there. The default setting of Local System Account on the COMODO service does not allow connection to the AV updates. I changed it to my Administrator account and the updates work.
However if you run a Diagnosis it shows as an error and allowing CIS to correct the error resets it back to Local System Account.
This is only affecting my XP SP3 Home Edition. Other software as below.
Regards, Dave