Problem with "-limit memory" and png files

[ggeeoo]

When I issue the following command

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convert -limit memory 64 -limit map 128 1.png 2.png

then instead of getting a 2.png which is identical to 1.png, I get a different image. If I remove either the "-limit memory" or the "-limit map" part then everything works smoothly. I'm working on gentoo linux with "convert -version" returning

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Version: ImageMagick 6.3.8 04/07/08 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2008 ImageMagick Studio LLC

but I had the exact same problem on a WinXP box with

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Version: ImageMagick 6.4.0 04/11/08 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2008 ImageMagick Studio LLC

Here's a link to the image file: http://rapidshare.de/files/39106454/1.rar.html

[magick]

We have a patch for this problem you reported in ImageMagick 6.4.0-7 Beta available sometime tomorrow.