Pairwise alignment not working reliably in 2.10.4b1

The Pairwise alignment command only works for certain pairs of sequences in my alignment, but not for other pairs. I think it is a problem with the command since it used to work for me without problem.

Thanks,
Mark

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Mark A. Saper, Ph.D.
Associate Professor of Biological Chemistry, U-M Medical School
Room 3220B, MSRB III saper@umich.edu +1 (734) 764-3353