I am experiencing this bug also - with the blank window up I did the
following in a terminal:
dgodec@Dimension-4600:/usr/share/themes/Orta$ killall software-center
dgodec@Dimension-4600:/usr/share/themes/Orta$ software-center
2011-07-26 03:59:33,961 - softwarecenter.fixme - WARNING - logs to the
** Attachment added: software-center.log
https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/772549/+attachment/2233359/+files/software-center.log
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