Avg blocking some emails?

I'm not receiving emails from one or two senders (who have definitely emailed) when previously I received their emails with no problems.  Is this AVG blocking them, if so why now,  and what can I do about it?

Ruth,
Good to see that the issue has been fixed by our technical support team recently. Let us know if you need any further assistance.

Ruth,
Good to see that the issue has been fixed by our technical support team recently. Let us know if you need any further assistance.