Radio Input Won't Accept "checked" Inside Fieldset with FF

IE is OK, and outside a fieldset is OK

[itKiwi]

Can anyone tell me why my radio input won't accept "checked" inside a fieldset, in FF?
IE is OK, and outside a fieldset is OK
The form has the labels on the left, flush right, with the form elements on the right, flush left.
Thanks.

[iamlost]

This sounds like it might be bug #252691:
When offline editing radio buttons to apply the 'checked' attribute the refresh button does not apply the attribute. However, closing and reopening Firefox does.

Note: an uploaded page displays fine.
This bug is currently unresloved.
A suggested work around is to add (if not existing) a form reset button and use it for confirmation of edit changes.

For any Firefox concerns always checkout 'bugzilla' on the Mozilla site.

[itKiwi]

Thanks. The problem occurred on a couple of prototype pages I was developing, but disappeared when I put the final one into it's framework. I hope the problem doesn't return as mysteriously as it disappeared ;-)
Thanks again.