Hi,
I have the same problem with Avast free antivirus 2015 (version: 2015.10.0.2206), on Windows 8, on Chrome AND on Internet Explorer. ANY site protected by "Trusteer Rapport" is showing:
Warning - This website is using an invalid certificate - ... - Reason for error: Bad certificate - ... Signer: avast! Web/Mail Shield Root - ... - Block Access / Allow Access ?
As I understand, this should have something to do with the New Feature "HTTPS scanning". How can i disable this feature (until this compatibility problem is solved, either by Avast or by "Trusteer Rapport") ?
UPDATE:
Found it, under: Settings - Active Protection - Web Shield - Customize