I Updated Business Version Now Cart Messed Up

Hello,
I have a few issues after updating the business version from 2.0 to 2.1.1

1). When a customer adds an item to cart the pop up box says "you have successfully added to wishlist". I have wishlist turned off so not sure why it's now stating this. Before update pop up box said "item successfully added to cart". This is how I want it.

2). I do not want customers to have to login and register, and I did have it set up like that before the update to 2.1.1. However, when I updated the cart, it changed all my Modifications in the cart and now customers have to register or login. So now if a repeat customer tries to place an order the cart says "email already registered" and will NOT let customer place the order. Since they placed their first order before we updated cart to 2.1.1, they never had to register so they do not have a username or password now. They now can't place an order without using a different email because they do not have a user and password to bring up their billing information. No customer is going to sign up for a new email just to place an order with us again. Customers will leave store with this problem, it's frustrating. How do I fix this problem.

--->I just want my cart set up where a customer checks-out without having to logg in or register. A lot of customers like myself do not want to have to register to place an order. My current programmer is tired of fixing the cart on each update because it reverts back to default and changes the modifications (this is the second time). I can't afford to pay my programmer everytime this happens especially when it's not my fault. My programmer is now telling me that the cart has to be in the Register/Login mode or cart will not work. I know this cannot be true. PLEASE HELP. Is there anyone here that can help me. I have been in business for over 12 years and honestly this cart is putting me out of business . My programmer obviously is done with fixing problems that keep happening to the cart, and I'm not a programmer. I just want the cart to function properly so that I can just move on with my business. I've had two Programmers that have tried working on this cart, and now it has been almost a year and still can't get cart to work right. They fix one thing in cart, then something else breaks on the cart. Please help..........

I believe I fixed register issue, just need to re-do shopping cart mods again. Found previous how-to fixes from other hikashop inquiries on forums. I'm testing now to make sure all works.

Only issue is that when I add item to cart the pop up box still states added to wishlist. I have that turned off so not sure why it keeps stating that. It doesn't do it all the time, usually only happens when I add the first item to cart. How do I fix this? I don't use wishlist.

Also at checkout the cart list only Canada, U.S. & U.S. Minor Outlining Islands for Address Information choices, and I do have set up as worldwide. How do I get the drop down to list for all international countries so that Int'l Customer is able to enter the address information and place the order? Before I updated cart I didn't have this issue, so need help on figuring out why it changed after update.

Thank you for your time.