This thing is still not working! I just checked on 3 different computers. IT WORKS ONLY THROUGH Category listings - that is when you go to a category such as: Components and then click on any of the categories, for example - Keyboards.
AFTER - DO NOT ADD THE ITEMS HERE - GO INSIDE A PRODUCT. Such as the first product - Saitek PZ30AU Black USB Keyboard - and click on the picture or its title - which will take you inside the product and you will see a COMPLETE description of the item there. On the bottom - you see an "ADD TO CART" button - but here it's already got a "1" in there not 0 such as the product category listings - so FROM HERE - if you try changing the quantity - it will always be 1!

Try it out. I asked my friend to try it to and he got the same result. I thought I was going crazy for a second.

Thanks for your help!

-Egor