Fred,
I am a group owner a large group. My group is having same problem. I
am not receiving notifications to moderate messages either.
I am also member of other groups and not receiving messages from those
groups either but can go to website and see activity.
Same advice as for Den and Joe: check your email delivery.
For messages addressed to you from specific group there's an Email Delivery History tab in your Subscription page.
For messages addressed to you from all of your group memberships there's the Bounce History page in your account.
Comcast is one of the email services that doesn't seem to be able (or willing) to handle the volume of traffic from Groups.io to the service's customers. To resolve this problem you'll have to convince Comcast to upgrade their reception limits from Groups.io.
Shal
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