Before i read your message, i launched two scans to test if they where functional :
- scans with 210904.2 don't hang at 0% (but yesterday they did with 210903.

- ... but the log you asked for has been replaced with the new ones so i can't send yesterday's log
Concerning the background protection, for this boot :
- 210903.8 was installed at boot time
- avastsvc CPU usage rose to 50% after ~10 minutes (rootkit scan it must be)
- update to 210904.2 made before or after this peek?
- i stopped/started the avastsvc via a net command
- 8 minutes later, with 210904.2 installed, avastsvc CPU usage is normal