Excluding Folders Does Not Work

I'm getting tired of Bitdefender reporting numerous Steam games as viruses, preventing me from downloading or installing them. I've added the offending folders (d:\games\steam\steamapps\common and d:\games\steam\steamapps\downloading) to Bitdefender Exclusions, but it does nothing!

Is there some trick to getting Bitdefender to do what I tell it to?

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