OK, I have the layout. I found that some symbols don't have explicit OR implicit power connections. Others use VDD and VSS instead of Vcc and GND. I found where I have moved a component slightly a caused a short between ground an power. I got all that fixed. But every time I start to run the power buss, I reach a point where pins are highlighted green, but the rat lines disappear, and the DRC makes it impossible to run a trace to the pin. I have to keep saving the layout, exiting the program, and starting over. Even reloading the net list and displaying the rat lines does not help. This is slowing things down quit a bit. But I don't think I can build a 4 layer board at home, and with only two layers, there is no ground an power planes, so I want the power and ground lines thick and well laid out, so I don't want to rey autorouting just yet. What I am doing wrong this time? Mike
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