When you maximize the size of a system, the node icons can get in the way of moving around the packet releasers. Just a small issue; it does get annoying when you mean to assign a key node to said packet releaser and accidentally hit the x right on top of it instead, or go from having finished using the x to switching to another icon to place on the board, only to select said icon AND the packet releaser at the same time, causing for you to delete it and then switch to the icon.