You don't mention what version of Outlook you're using.
My suggestion would be that you uninstall AVG, restart your PC/laptop, then
reinstall it but omit configuring it to actively scan incoming and outgoing
email. This won't compromise your security since your real time scanner will
catch anything it's been updated for. AV is a common culprit of receiving
blank emails, duplicate or multiple emails, etc.
Kathleen Orland - MVP Outlook
Outlook Tips: http://www.yqcomputer.com/