(reported by M. Rothwell and D. Kregel)
While rendering line drawings with rtwizard, the resultant image is
black. The simple full-color picture setting via the tcl gui seems to
work just fine.
The problem seems to be related to the -c argument processing as
the -c string is not getting properly passed to rt via the command
window, nor does it parse correctly manually on the command line.
There seems to be a disconnect as to whether a space is required
after the -c (should not be) as well.
This problems seems to have been introduced in release 7 as 6.*
seems to be functioning properly.