Hi,
C:\ProgramData\AVAST Software\Avast\report\webshield.txt may show the issue.
Have you tried adding a script exclusion for the site? If using a console to manage the devices
device settings>template used>active protection>customize link for webshield>script exclusions
You can add the exclusion locally to test also
settings>components>customize link for webshield>script exclusions
If using a console just make sure to add the URL in the console if testing on the local client and this resolves the issue.
If you still have problems, submit a support ticket and we can take a closer look to see if we can identify the issue.
Thanks!
Thanks!