I just tested the file neilo sent as well, and it is working for me too.
so this leaves me to believe that there may be a php error occurring but error reporting is turned off.
try adding the following code at line 1 of your file:
just to ensure that all changes are actually making it up to the server, in design view, add today's date in the body, this will give us a visual que that code changes are actually making it up to the server.
If your still having problems, please send a copy of the page you are using, so I can have the exact same code for comparison.