I tried to use the event recorder on a login form.

<form id="loginForm" action="..." method="post">
...
<input name="login" type="submit" value="Login To Application">
...
</form>

The submit button just has a name and not an id. The recorder tried to generate events for the loginForm and so the button was never clicked when replaying the events during a running test. I fixed this by changing to a css selector

input[name='login']

The tool should be able to handle this type of scenario, though.