Question regarding Sandbox & SafeZone in Avast Internet Security 2015

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I have 2 questions that I hope someone can help me with:

(1) A root scan performed by ThreatFire flagged a hidden file within the Avast Sandbox as a high risk.  Is there supposed to be a hidden file in the Sandbox?  If so what does it do?

(2) Do you know of a detailed help page concerning the SafeZone?  I cannot get it to work on either of my two computers.

Thank you for your time.

[Pondus]

If so what does it do?

1. very difficult to answer since you dont give any file info or ThreatFire log   

2.  avast FAQ  https://www.avast.com/en-eu/faq.php

FAQ videos  https://www.avast.com/en-eu/faq.php?q=video#searchForm

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Thank you for your prompt response!

In regards to my #1 question, I was just wondering if there is supposed to be a hidden file in the Sandbox.

I will check your links regarding SafeZone.  Thanks again.

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I read articles and SafeZone is still not working for me.  I have Windows 7 and use latest version Firefox.  Any suggestions?