I thank you all for the input, but to be honest, it was almost too much info for me to filter through. At this point I'm not sure what to do so I'm going to start with DavidR's advice: The biggest potential for conflicts is in the _avast5_ sub folder of Temp (C:\WINDOWS\Temp\_avast5_) as that is where avast unpacks/scans files and the last thing you want is another resident scanner locking files in this area. So that is an area I would exclude in MBAMs real-time scanning.
DavidR, as I understand things then, I should make no exclusions in Avast, but make this exclusion in MBAM? Do I enter this just as you show it then? (C:\WINDOWS\Temp\_avast5_)