> Do i just use the debug commands like so or should i give it some arguments.
> valgrind rosrun rviz rviz -d `rospack find
> sicktoolbox_wrapper`/sick_test.vcg
> gdb rosrun rviz rviz -d `rospack find sicktoolbox_wrapper`/sick_test.vcg

Don't use rosrun with gdb (might be the same for valgrind), use the
executable directly.

With gdb you will need --args if you want to specify the command line
arguments on the command line.

By the way, it is rviz crashing, correct?