I've not been following this and my reply doesn't address the topic. From your reply "but I read my groups online" I take it that you have only one email address as owner of the group. I've got 3 in my large group and 2 in my small groups as well as multiple owners. I've got memberships under Yahoo, gmail and aol and at least 2 of them set as owner. That way if any one of them gets deleted or becomes corrupted, I still can log in as an owner. It also gives me the ability to test different settings so I can see what members are seeing.
For you own security, create an owner for yourself under a Yahoo email address.