If you have time, I'd like to understand this problem .. Are you running this with the JEmplode executable that came with the JEmplode installer? If so do the following:

1) open you install directory (defaults to C:\Program Files\JEmplode 2.0)
2) make sure you've replaced the jemplode20.jar in this directory with the one from http://www.batmanthehorse.com/jemplode/jemplode20.jar
3) open JEmplode.lax with a text editor (wordpad or notepad)
4) add a new line anywhere in it that says: "debug=true" (without the quotes around it -- you'll see the others that are a similar format)
5) look for two lines that say:
lax.stderr.redirect=
and
lax.stdout.redirect=

and change them to
lax.stderr.redirect=status.txt
and
lax.stdout.redirect=status.txt
6) Run JEmplode.exe
7) After discovery fails (which I assume it will based on your previous description), just quit out of JEmplode
8) Email me the file "status.txt" in your C:\Program Files\JEmplode (or whatever install directory you chose) -- my address is [email protected]

Hopefully this will contain some useful debugging information ... I'm very curious about this one. Is there anything unique about your computer or network configuration?

Thanks a lot
Mike