SSL Connection Untrusted

I had my host install an SSL certificate for me earlier today and since then when I add an item to my cart, I receive the Connection is not Trusted warning. I have gone through various topics on here covering this issue but am having trouble figuring out where the warning is originating from. In configuration/checkout, I have Force SSL on Checkout set to Yes. I saw other comments concerning the Shared SSL setting to where an input box allows you to enter an address for your secure checkout (not sure if that is a correct way of saying that). However I cannot find a field to put anything in if I select Shared SSL.

I checked with my hosting vendor on this after the cert installation and they indicated this is being caused by a setting in the cart.

Example is at www.silverconnection.com/index.php/categ.../category_pathway-12 and then select the Add to Cart button for the warning.

Advice on what I might be overlooking?

Okay, thanks very much for checking. It's strange, I received the warning on my main laptop the first time (firefox), then after that I did not receive it again. But I did receive it on a work computer using firefox. Then, no warning on a different laptop with IE. I will keep on eye on it. However in reading some topics last night on SSL, I added the following code to the view Checkout/payment:

if(strtolower($_SERVER) != "on"){
$app =& JFactory::getApplication();
$requestUri = $_SERVER;
if (!empty($_SERVER)) $requestUri = rtrim($requestUri,'/').'?'.$_SERVER;
$app->redirect('https://www.silverconnection.com'.$requestUri);
}

Is this necessary?

There is another issue I am noticing and that is going from non-ssl to ssl to non-ssl within the site. I will start a different topic on this.

Just for informational purposes, it appears that this is a firefox bug to where the browser is not acquiring the owner information of the cert and while it indicates whom the cert is assigned to, the owner info displays unknown. An interesting debate on this is at bugzilla.mozilla.org/show_bug.cgi?id=429021#c42

So I am working this issue through my host. Thanks for the response.