[avast! 8 Pro Antivirus] Random doubled attachments

Hello,

I suspect avast! doubling attachments from my mails.

When I receive an email with an attachment on my Microsoft Outlook 2010 randomly attachments are doubled. I suspect avast! to be responsible for the duplication. Someone have already encountered this problem ?

I checked the mail server of my email provider, attachments are not doubles. So my PC, when its action receiving mails and after analysis of avast! which I think is responsible for this doubling mails. It is the only part of my potential perspective that analyze incoming mails.

This problem occurs only on incoming mails