Sorry, but that does not make any sense. If Avast looked at a piece of website data(HTML, Javascript, etc.) and said “Malware!”, then realized that was false, and amended their code to look at the same website data and say “OK”, then it should not require me to do anything with my browser cache. The only circumstances where that would make a difference would be if :

  1. Amazon truly did have malware on their site
  2. Amazon changed their data to be the same functionally, but written so as not to get a false flag from Avast.

In any case, as mentioned, I dumped my browser cache and the problem persists.