This appears to be an issue on 64bit 10.6 machines, and due to a bad build of 
perl. 
Hopefully Apple will look at this.

There are two work around:

1) EASY: Change the first line of the csshX code to be:

#!/usr/bin/perl5.8.9

This will work for 10.6 but break the script on all other platforms


2) FULL: Replace the first line with:

#!/bin/sh -- # --*-Perl-*--
# Mad perl detection for broken 64-bit 10.6.0
for p in perl5.8.9 perl; do
    if [ -x /usr/bin/$p ]; then
       exec /usr/bin/$p -x -S $0 ${1+"$@"}; fi
done
echo No valid perl found - please submit a bug at http://code.google.com/p/csshx
/issues
echo Please attach the data below:
echo --------------------
sw_vers; ls -1 /usr/bin/perl*
echo --------------------
exit 255
#!/usr/bin/perl
#line 17

This will continue to work with all 10.4+ versions and will report debug info 
if it does 
not work. (This is also at the top of the current SVN trunk version)

I am working on a new version of csshX that will use the Cocoa scripting 
bridge. I will 
close this ticket when I release it..

if you actually take the errors advice and look into man perl you'll find that 
it's
just the perl version compiled isn't 64 bit compatible.

adding:

export VERSIONER_PERL_PREFER_32_BIT=yes #needed for csshx to work

to your .bash_profile should fix the problem... or at least it did for me.

[deleted comment]

Released in 0.64: http://gavcode.wordpress.com/2010/03/30/csshx-0-64/

[deleted comment]

(removed previous comment, it works fine)

Thanks gavin that works, but the line:
      exec /usr/bin/$p -x -S $0 ${1+"$@"}; fi
needs to have quotes around $0 or it will break on paths with spaces.
      exec /usr/bin/$p -x -S "$0" ${1+"$@"}; fi
Works great!

@mats.tornros

Thanks for the feedback - those shell expansions are always error prone.

However, this workaround is no longer needed - the current version  will work 
fine on 10.5 and up with the 
default perl - you can get csshX 0.72 at:

http://code.google.com/p/csshx/downloads/detail?name=csshX-0.72.tgz

(Lots of other goodies and bug fixes in there too)