It appears I've been flagged for 'an instance of sharing'. Still waiting for some clarification on what they've seen, but there's been absolutely no sharing of my account or any part of my addons from my end, so can only guess that it might have been either me moving my PC between our houses and thus showing a different IP albeit on the same hardware, or some 'hack' may have occurred..
Either way, still awaiting word back from X-Aviation.