Why is Avast blocking Stock Rover?

Avast scans https traffic using a product that is not compatible with the SSL certificate used by Stock Rover. Please disable Avast or add the Stock Rover website to Avast’s list of sites to exclude from scanning.

Here is a link on how to add an exception in Avast:

We recommend adding the following URL to the exception list:

Note: the * is required following the URL

How do I change the size or... Why is AVG blocking Stock...