I'll hold my breath  :-[

Problem is half-fixed.

SSC doesn't hang anymore, it's just unable to generate a valid filename.

For instance, if I capture the very IE8 window I'm typing into, I get:

---------------------------
SCREENSHOT CAPTOR - ERROR SAVING FILE
---------------------------
Error saving file 'd:\private_sba\net\Captures\http___www.donationcoder.com_Forums_bb_index.php_topic=16214.0
Screenshot Captor 2.44.01 hangs when capturing IE window - DonationCoder.com - Windows Internet Explorer 20090610154818.png'.



 Filename or path may be too long or on missing drive letter, etc.



 Change filename below or use File->Save As menu to specify filename, or File->Discard File to skip saving this file.
---------------------------
OK   
---------------------------

It seems SSC generates the following filename:

d:\private_sba\net\Captures\http___www.donationcoder.com_Forums_bb_index.php_topic=16214.0^M
Screenshot Captor 2.44.01 hangs when capturing IE window - DonationCoder.com - Windows Internet Explorer 20090610154818.png

IOW the filename contains an embedded newline.

My configuration specifies

%windowtitle% %customdate%

as the filename template.

This might be related to %windowtitle% expanding to <URL><newline><page title>...