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I’ve had exactly the same problem this morning - Win7/64bit running avast free 6.0.1289; able to log on as other users, but my main account runs the avast SafeZone and won’t close it or allow you to do anything - can only press Windows-Key+L to switch user…
After speaking to support, turns out a reboot should fix it! Avast didn’t prompt me to reboot after the update to 6.0.1289, so not sure what’s going on… but the support guy was great and got it sorted with no hassle 