Ok, pulled it down and have version 4.1-e378b04ea3b7 installed now. Same results as before. PSM gives the correct output and GC gives the black lines.
> From: Mikolaj Leszczynski <email address hidden>
>To: <email address hidden>
>Sent: Thursday, May 3, 2012 10:40 AM
>Subject: [Bug 989908] Re: black lines from graph-cut seam generator
>Kevin, I updated the enblend seam visualization code.
>Would you please be so kind as to use the latest development version and
>send me the visualization output from the images you are having problems
>You received this bug notification because you are subscribed to the bug
> black lines from graph-cut seam generator
>Status in Enblend:
> Using enblend 4.1-e378b04ea3b7 I'm seeing black seam lines when the
> graph-cut seam generator is used. When I switch to use the nearest-
> feature-transform seam generator they go away. It's a large stitch
> involving 13 images. You can see the difference between the outputs
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