Hi all, I'm working on a board that uses a 28 pin QFN package. Unfortunately, whenever I try to route a trace away from the QFN part, the line that I'm drawing just disappears. I cannot route traces to the part from other parts either. If I try to run the autorouter on a obviously clear ratwire I get a "No Path Found" error.
To demonstrate this problem I've posted the file on my website: http://oscar.dcarr.org/usb2lcd_rev0.pcb The QFN part is the one with the paddle in the center of the board. Just try to route any of the ratwires to or from this part. I cannot do so. I checked the clearances for each pad and they are set to require 6mils clearance (3mils per side) --- so I don't think that is the problem. I'm using PCB 20050609. Thanks for your help, David Carr
