problem with NetBeans IDE debugger

I am a beginner, using NetBeans IDE 4.1 Early Access 1 for the very first
time.  I am trying to step through a small program, a simple Java
application, that is known to run correctly.  Something appears to be
radically wrong: I do not see any visual cues on the screen, in my program's
source files, indicating where the current point of execution is.  All I see
is some text in the output/debug window indicating the current line number
(and this window does not automatically scroll as new text lines are added).
I tell the prgram to step a single line, but it stops (according to the
debug window) somewhere else.  It doesn't step into functions.  When I
double-click on an entry in the call stack, nothing happens.  I can only
guess that I have not installed the program correctly, or that there is some
setting that needs to be adjusted.  Can anyone help?

Robert R.