When invoking javaws from the command line with no arguments you get back a list of valid arguments and usage information. On Mac OS X this information has a blank line inserted between each line of the output, making it harder to read.

To reproduce:

1. Install any build of 7u4 or later.
2. Launch Terminal.app
3. Enter "/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/javaws" and hit return

==> Output:
Java Web Start:

Usage: javaws [run-options] <jnlp-file>

       javaws [control-options]

etc.

---> You should see
Java Web Start:
Usage: javaws [run-options] <jnlp-file>
       javaws [control-options]

where run-options include:
  -verbose display additional output