I tell you why you think you get crawling ants around both - they are on different layers. If you select one (alpha to select - or select all) it will get crawling ants. Otherwise it should have just black & yellow dashes around it if the layer is selected. Otherwise if the lower layer has a selection in the middle inside the size of the top layer - the selection will show through that layer. You can get rid of any selections you dont want by clicking on select (from the top menu) and none.
If your plate is round use the ellipse select and copy it onto (as a new layer) the background of your color choosing, making sure it is 300 ppi when you make the background. Make a transparent layer above your background and below your plate. Make sure you have a horizontal and vertical guide at 50% each and centre your plate on the cross section. Using the rectangle select, in the tool options click on expand from center and starting at the intersection of the guides make sure your size in the tool options box is the same width as the height and you should have a proper square then.
Stroke this selection, fill it or both (However you want to go about it).
Maybe someone knows a quicker way to go about it.
If your plate is round use the ellipse select and copy it onto (as a new layer) the background of your color choosing, making sure it is 300 ppi when you make the background. Make a transparent layer above your background and below your plate. Make sure you have a horizontal and vertical guide at 50% each and centre your plate on the cross section. Using the rectangle select, in the tool options click on expand from center and starting at the intersection of the guides make sure your size in the tool options box is the same width as the height and you should have a proper square then.
Stroke this selection, fill it or both (However you want to go about it).
Maybe someone knows a quicker way to go about it.