I have the MBAM pro with real time protection. I had to add Avast to MBAM Ignore List in order to permit Avast updates and other Avast communications with web.

Right-click the MBAM icon in system tray.
Select ‘Start scanner’ to bring up the user interface.
In the ‘Ignore List’ tab click the ‘Add’ button.
Enter the full pathname of AvastSvc.exe
Click ‘Add’ again and enter the pathname of the Avast folder.

Then click Exit to close the user interface.