Like others (more than 120 days ago) I cannot log into Halifax Bank on-line using Avast Safebrowser.
https://forum.avast.com/index.php?topic=185733.msg1359885#msg1359885
I was able to do so until I updated a graphics driver a few days ago.
So, what should I do?
To start with, best you post in the dedicated forum section… 
→ https://forum.avast.com/index.php?board=78.0
Roll back your graphics driver.
Hi Bob, already solved, check: https://forum.avast.com/index.php?topic=220854.0