This topic is very much relevant again. A regression seems to be happening.
I also encountered the message about sensitive document today in the free version.
For anyone still seeing the "Sensitive Data" item showing in Smart Scan:
Try resetting the Smart Scan options by going to Menu->Settings->General->Smart Scan.
That settings option does not exist any more.
I'm curious how and what Avast recognizes as sensitive documents.
Is it language specific?
Does Avast know your sensitive document IDs?