I've been using Avast Free v 5.1.864 a couple of weeks. Running Windows 7 x64 and use Privatefirewall, Malwarebytes, SUPERAntiSpyware, Spyware Blaster, SpyBot S&D, Windows Defender, Virgin Media Antimalware and PC Tools ThreatFire (anti-malware all on demand except for WD and VM).
'The real-time shields are the most important part of the program' says Avast's help file. No history on my shields' graphs for three days, though they say they are working.
I reinstalled Avast as the quickest way to check. The orange ball came back to life and the file shield graph spiked. But both just the once.
Set the file shield to scan everything, took forever to open anything and still nothing moved on the file graph. Nothing from the orange ball. Email shield seems to work, though? Others don't work under standard user, elevated privileges or logged in as admin.
I can right-click scan etc and I'm pretty sure there's no nasties as all scans say I'm clean. Sorry to ramble on, but this all might be linked to a scare I had three days ago clicking to a free fonts site from google (McAfee and MyWot showed green). Browser magically changed into a virus scanner filling with found viruses, Avast popped up and broke down and Malwarebytes broke the OS. Rebooted into Safe mode, found nothing. Back in normal Avast repaired itself, or so i thought. I Alt F4'd the browser at the time and pretty sure nothing nasty got on board. Maybe I'm misunderstanding what Avast's graphs and orange ball should be showing me?