I designed my schematic using all SMD parts, but when I switched over to the board, I can't connect the air wires when manually routing. When I run the auto route, it connects the pads without a problem, but I much more prefer to run manual routing. If I add in through hole components, it connects the pads without an issue as well. I've made sure the trace starts over the pad, and connects over the other pad, but the air wire doesn't go away (even after cleaning up the rats nest) . When I highlight the net, it highlights the pads but not the trace, even though both the pads and trace are on the same layer. Any suggestions?