New version of AbanteCart, installed just a few days ago (version 1.2.0). Here's my questions/problems list:

1.) I get a message about a core update, but when I go to the link, it says there's nothing there. No updates are showing under the "Updater" either.
2.) I have Authorize.net as my store's only payment method, and when I turn "Auto Select" ON, during the check-out process it doesn't auto-select. It also doesn't remember the shipping choice from the cart, a customer has to select it again and then the payment select option appears and Authorize.net has to be selected.
3.) Is there a way to remove the coupon field from the shipping and payment selection page as well? Right now, there's only the option to remove it from the cart page that I can find. I would actually prefer to be able to remove Checkout Step 2 all together if possible as there's no reason to have it there with shipping method having been chosen in the cart and there being only one payment method to chose from.
4.) I can't seem to change the favicon. I searched and found only "favicon.ico" and "4.ico" and replaced them both. There are no other .ico file in the directory, but my store's still showing the default AbanteCart favicon. I cleared the cache an tried in different browsers.

Note: In the UPS extension, the ON/OFF buttons for shipping methods seem to be reversed. I have to turn them ON to turn them OFF and visa-versa. It's not really a problem to do that of course, but I thought I'd mention it to you anyway. (I tried this fix for the Authorize.net auto-select issue, but it didn't work)

Thanks in advance for any help offered.

I have an update. To see if I could troubleshoot this some on my own, maybe find the point of failure, I installed a fresh version of AbanteCart and went about building the store as I did before, checking the front end every few steps to see if the scripts I mentioned before were still working.

I deleted the sample customers, orders, products, categories, and manufacturers, and then created a product. No problems up until that point.

Next, I modified the page layouts for "Default Page Layout", "Home Page", and "Default Product Page", and then uploaded a new version of "style.css" via FileZilla (version 3.9.0.5) and checked those scripts again. They'd failed, just like they had before.

I restored the default version of "style.css" and returned the page layouts to as close to their default appearances as I could remember, but the scrips still did not work.

I did not modify this new test install of AbanteCart in any other ways than those I just described.

Any idea what could be going on?

I just talked with Authorize.net, and they say that the credit card info is secure, but that there's a chance that the credit card info entered after the site was hacked could have been stolen by the malicious PHP sending the info to both a 3rd party and Authorize.net (but only those entered after, none before).

Thanks for the info. And I don't really know how to find the info you asked for in our logs. I will ask our web host people though and let you know what they tell me.

I just heard back from our web host company, and you were right, there were compromised PHP files. They are running a full scan now.

Oh, sorry. No, I don't think there was much customizing. Just a custom CSS. Other than that, just using the UPS, FedEx, and Authorize.net plugins. I can't think of anything else that's been changed or customized.

And I'll do my best to look into the PHP (I'm not an expert in this sort of thing though, just a graphics designer who's somewhat talented at figuring things out when I need to).

Suddenly, our online store is just showing seemingly random customer info to anyone who visits the store. They don't have to log in or anything. Someone who called in on the phone even said she saw another customer's credit card info. I had to put the store in maintenance mode for obvious reasons. Any idea what went wrong or how this can be fixed?