boot time scans not showing up in scan history?
It has its own log:
C:\ProgramData\Avast Software\Avast\report\aswBoot.txt (Vista, Win7 or later OS), check this file using notepad for info on the scan/detections, etc.
Was there a specific reason for running the boot-time scan ?
The boot-time scan settings in avast 17.2.2294 appear to have changed somewhat. Its settings don't appear to be as configurable as it used to be, no sign of the Generate Report option.