Strange behavior of "what" command?

[forkandwait]

In my effort to write a recursive test command, I have learned about "what".  
However, I get odd behavior, with what not seeing certain files, for no reason 
I can determine:

octave-3.3.50:1:foodemog> what Code
M-files in directory /usr/home/wsprague/foodemog/Code:
   examples.m   prjcmp.m     r2les.m      runusa.m                            
octave-3.3.50:2:foodemog> ls Code
examples.m      prjcmp.m        r2les.m         runusa.m        tsnarf.m
octave-3.3.50:3:foodemog>

I wondered if there is something in the M-file itself, but I am not sure what 
it could be.  Also, the missing function (tnsarf) is available in my octave 
session for me to run.  Any advice would be appreciated!

However, ... if you return a value it seems to get all the m-files in the 
directory:
octave-3.3.50:9:foodemog> x = what('Code')
x =
{
  path = /usr/home/wsprague/foodemog/Code
  m =

  {
    [1,1] = examples.m
    [1,2] = foo.m
    [1,3] = prjcmp.m
    [1,4] = r2les.m
    [1,5] = runusa.m
    [1,6] = tsnarf.m
  }

  mex = {}(0x1)
oct = {}(0x1)
mat = {}(0x1)
mdl = {}(0x1)
p = {}(0x1)
classes = {}(0x1)
}



Tx!