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Date: Mon, 12 Mar 2012 06:54:02 -0400
From: gene glick <geneglick AT optonline DOT net>
Subject: Re: [geda-user] Very confused...possible PCB bug?  Need help.
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> Are there any known conditions in which PCB might think that two nets
> are shorted when they actually aren't? Does anyone have any suggestions
> as to how I might chase this?

Have you tried using the 'divide and conquer' approach? Delete a section 
of the board, see if the short remains (ignoring those 'not found' 
errors). Delete another section see if remains. Keep going until you 
zero in on a region where the fault is.  Then start cutting down that 
section. Eventually, you will find the problem.

gene