I’ve had the same problem on most of my WordPress sites. Complained to Norton, they did a little research, then contacted me yesterday and said that the problem was their code, not mine…and they hope to have it fixed sometime within the next few days. So…we’ll see. In the meantime, maybe try switching to Avast until they get the problem fixed.
Excellent piece of work! But the inability to re-size the gallery display photo is a “fatal flaw” for me. Most of my original photos are low-res and around 250 pixels square…thus become almost unrecognizable when doubled to your 600+ pixel default size. Not a pleasant sight to see. In other words, I think you should consider this to be more than a “back-burner” issue. But, again, it is otherwise Great!