Pay mode tab on hold

I have been having this problem for weeks; every time I try and net-bank it goes to “pay mode”, then stalls on “pay mode has put this tab on hold to protect it from key loggers etc” and I am unable to log on to banking sites at all?!! Wth is the point of this? There is are not key loggers and no reason for this error. Avast?

https://forum.avast.com/index.php?board=78.0