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Two times the fun! Double Norton Toolbar.
I've been having a bit of an issue for a while now, and figured that it would sort itself out, but so far no joy.
Using Chrome (currently v48.0.2564.97 m) across a few systems.
Every few days, the Norton Toolbar just goes offline, and usually when I check the extensions, I see two disparate versions of the extension installed.
If I remove both versions, and then reinstall, it resolves for a time, but invariably returns to the failed state.
Here is what I see in my extensions list: