"Cannot allocate memory" when cropping , resizing and converting jpeg->png

Dear ImageMagick Team,

I can't convert, crop and resize images anymore, which was working fine
with my previous 5.x release. I now get a "Cannot allocate memory".

I am using Gentoo Linux on IA-32, ImageMagick is installed with emerge.

The picture transf-795 is at:
http://litchi.zib.de:555/viz/service/job/0/views/img-t30-view4.jpg

$ convert -crop 498x497+245+124 -resize 180x177! transf-795.jpg
t1234893108.png
convert: Memory allocation failed `Cannot allocate memory'.
$ convert -crop 498x497+245+124 transf-795.jpg t1234893108.png
$ convert -resize 180x177! transf-795.jpg t1234893108.png
$ convert | head
Version: ImageMagick 6.0.7 10/05/04 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2004 ImageMagick Studio LLC

Usage: convert [options ...] file [ [options ...] file ...] [options
...] file

Where options include:
  -adjoin              join images into a single multi-image file
  -affine matrix       affine transform matrix
  -annotate geometry text
                       annotate the image with text
$

... Felix