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Yet another, more direct way (assuming you are fine with unix commands) to find that offending arc. (if it's not a bug)

cat name.pcb | grep  "\sArc"| sed -e 's/\[/ /g' | awk '{if ($2>xmin && $2<xmax && $3>ymin && $3<ymax) print $0;}'

x/y/min/max you determine approximately from gerber.

Суббота,  5 октября 2013, 17:32 +02:00 от "doragasu ." <esakaforever AT gmail DOT com>:
> 
> There are 199 arcs in top layer. I tried removing them all, exported to
> gerbtool and the problem disappeared, so maybe you are right and there are
> some "invisible arcs" somewhere. So I should look for arcs whose "|StartAngle
> - DeltaAngle|" is 90, right? A quick look didn't throw anything suspicious,
> I'll look thoroughly again.
> 
> Thanks!


-- 
Alexey Blinov