Avast Script Shield Exclusions
It is very annoying that you can't directly get more details about the block, possibly to create an exception in the Antivirus software. It is also very unlikely that Google is linking a malicious Script to the Account Settings page of their users.
So i think its safe to create an exception in this case. To do that, we will need to open the Script Shield of Avast:
Next click on Expert Settings:
Then click on the Exclusions button:
Then in Exclusions add the following URL:
See: Absolute and Relative Paths to learn more about paths on the web.
The (*) wildcard at the end of the url means that it should match anything after the domain. It is also possible to use wildcards in the subdomain part, but thats another subject.
Why not add your own website to the Exclusions lists now that you have Avast Open? No reason to scan sites that you already know to be safe.