On Sep 1, 2017, at 12:01, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
ah! ok, i know what it is - it's the centre mark of a big pad on the layer below. nice feature (gets in the way, here) - the centre of a pad is marked with a to-scale circle that is displayed on all layers. in this case, as that's a 1206 component the circle is huuuge.... and coincidentally the same size as a VIA :)
so... can be safely ignored.
Thank you for setting my mind at ease.