>Good question
>This is PHP app that I'm running on a WAMP platform from the Eclipse IDE, so Apache is involved.
>The default browser is IE and that's what comes up when I run the app from Eclipse.
>The way I finally isolated it was to view the source in IE and copy that to a file that I could run from Eclipse without any PHP.
>I kept removing things till I had one form that showed the checkbox and one that didn't, the only difference being the id.
>I searched all over the web and found nothing about it.
>It's only the checkbox.
>I tried other input types and they showed up OK.

Would still be interested to know if that HTML source was able to show both checkboxes with other browsers.