I was still operating under what you said formerly, "If you revert to a standard Weebly theme and still have the issue we can escalate a ticket to support for you. " If you weren't intending to escalate a ticket to support, why would you suggest that's what you'd do? Did Adam get a chance, to take a look at the problem?

Deleted, double post

Nevermind. I've decided to go with the Disqus comment box. Thanks.

I took a quick peek and there was. CSS rule that was hiding the default browser checkbox with a different one. I don't know if that was our own styling or not, though. It looked like the box was actually being checked and unchecked, but was hidden so you were seeing a custom styled box. Switching to Disqus is definitely an easy way to get around the issue, though.

Thanks for taking a look Adam. What you said makes sense. After trying everything already suggested, and a few things of my own, I wondered if it was the (Stay Updated) newsletter-like form, that came with the original, standard theme. It was different to the Newsletter form, you insert while building a page. As that one mentions, ticking a box to receive promotional material. I wanted the one, that didn't - the original, that came with the theme. 

As the original Newsletter form, borrows from the same subscribe by email code (only without a checkbox present) I wondered if it was flagging other checkboxes with a blank too? It's the only element, I didn't try removing. As by that time, I decided to go with Disqus. Just a guess on my part, but it seems to correlate to the hiding of checkboxes, you mentioned. 

Thought I'd share, in case it comes up as a problem for others. One more option to try removing. Cheers.  

Back again, Adam. I've gone live with my website and trying to get my existing audience to use the Disqus comment box. However, they're nervous to use it - as I suspected they might be. I have people commenting on my old blog, they don't want to comment on my new one. Because of Disqus. So I've reverted back to the default, only the checkbox still isn't working. Can you take a look at that code again, which might be hiding the default checkbox?

Hi BJ, and thanks for chiming in.

I went through Pages tab > Blog > SEO Headings > and pasted the code :

<style>
    #commentPostDiv #commentInputs .field input
    {
        -webkit-appearance: checkbox !important;
    }
</style>

...under Header Code. Pressed publish, and the checkbox still doesn't check on the refreshed website.

I don't have a header on my blog page, but tried it under both Header, and No Header, types. The result was still a blank checkbox, on both. If it hasn't worked, maybe this helps to isolate what might be behind the problem?

Thanks for checking back in, BJ,

I was hoping that would do the trick, this time around, but it's still not checking the box, successfully. At least, with a visual, "tick". The actual service is engaged, if you click it once - but the tick doesn't appear. Which is confusing for new users, and makes my weebly site look unprofessional.

It's so weird how it's not applying that. You have a custom theme, right? If so you could search through your theme's css for "#commentPostDiv #commentInputs .field input". 

There will be a rule in that which has  -webkit-appearance: none;

If you delete or comment that out it should get the same result. Well, successfully get the same result.

BJ, I am customising a weebly theme. I thought I woud try deleting "-webkit-appearance: none;" from the main.less STYLES, just to see if it would work. Sadly, no change. It demonstrates consistency, at least. Whatever is overriding the default checkbox from appearing, isn't going to budge. I've put in a support ticket with Weebly, as Bernadette outlined earlier. But would welcome any suggestion, others would like to contribute. Hopefully, this issue can be fixed.

Weebly support will probably suggest switching to a standard theme, which probably would fix it for you although you'll probably need to re-do your theme customizations. I'm as baffled as you are as to why we can just override it. Sometimes CSS is maddening.  

I've already tried switching to a standard theme, and it didn't change anything. Only when the site was copied (as Bernadette did) would it affect the tick, in the way it's supposed to operate. I suspect it's a weebly code issue, and nothing to do with my css. As I was having this issue on a standard theme, only using apps from the weebly store. Perhaps it's an app? Five days have passed, since submitting a support ticket though - maybe four days, accounting for overseas time. Thanks for your contribution though.

We're getting a higher than normal volume of mail right now, so it's taking longer to send out replies than we would like. You should hear back from our team soon, though.

I appreciate the heads-ups Adam. Thanks for letting me know.