webfacing first steps

Hi everybody.
I reckon that the list must be sorely flooded with messages like this one,
but after a few search attempts I couldn't find anything that did anything
to help me here. Maybe you can shed some light on this with your collective
wisdom.
 I am attempting to 'webface' my first application.
My choice was to convert a 'real' application rather than the usual
tutorial, something that I had been using in production for about 2 months
without problems.
The DSPF conversion went without trouble, no errors nor warnings.
I started *WEBFACING on the AS400.
Created the call statement, filled the user-password info, etc.
And then I tried to run the program using the test enviroment.
 At first, things looked good.
I mean, all I got this pretty page with a 'launch this' button and I was
full of warm and happy feelings about a webfaced future and a smoothly
vanishing green screen.
The came the actual clicking of the button and I got a full bunch of
nothing. The page reloaded and I was back at staring the pretty button.
(Which, of course, it is not the desired behaviour).
 It is sort of calling the program, because any errors in the CALL statement
are promptly followed by brand new errors. But for some strange reason is
either exiting without doing any work, or displaying any screen, or
anything.
 I am assuming there must be something extremely stupid and obvious I am
missing. Does this scenario fit some kind of usual newbie problem?
Just in case I wrote an even easier program with an even simpler screen and
attempted the same thing, just to get the same problem.
 Any hint would be greatly appreciated.
 Regards,
 I.-