I have the same issue and it sucks. My emails continue to be marked as ***SPAM*** or ***PHISHING*** but they all pile up in my Inbox with everything else!! Plus, and this is the WORST thing, I can no longer use the Antispam bar to mark messages "whitelist" or "blacklist". What is the point of having an antispam function that doesn't actually remove spam from the Inbox and also doesn't allow users to fine tune by marking messages the autofilter might have gotten wrong? Jeez!!
In another thread I did go to my menu bar and look under: Tools > Trust Center > Add-ins. I can SEE that avast! Antispam is listed under Inactive Application Add-ins -- but there's no way to enable or make it active again.
I'm with the rest of you. So far I have really liked avast! I even recommended it to others. But the Antispam function is something that users actually TOUCH and USE, often and on a regular basis. Screwing with that is like screwing your customers. I will definitely be shopping for an alternative. I only regret that my subscription runs through next June, although I could also jump ship now... I am SUPER disappointed. What were they thinking???