I took note, and am unable to confirm on my envy W10 with Premier on bc (just updated)
No issue with BS on this OS and Avast installation Bob.
Possibly just a glitch from something

My other W10 is updating the same as I write. See if the Windows Update affects the Avast Installation on that OS>

Edit: Windows update completed/rebooted and checked. No issue with the BS on either W10 OS