So, the pins are automatically isolated from GND? Do the parameters set in the net classes only apply to autorouting? Will I have to re-trace everything?The program does this automatically. CLEARANCE is set up in the DRC dialog. Your setting is now 5, which is probably too small. Use something like 10-15mils. In fact, all your settings are too small (I'm assuming MILS) . Use 15 as MIN WIDTH, 20 as MIN DRILL and 15 for CLEARANCE. A drill much less than 15mils usually costs more to produce.