Problem with my "buy now"

[lhungil]

Ahh, this is why providing full details is always so important. Note my earlier post. You have different settings then the ones I have been testing / talking about.

It appears you have:
Display Product Add to Cart Button: 1
Display Multiple Products Qty Box: 0

That said, I can see the problem. Looks like a bug is present in the Zen Cart code as "stock" Zen Cart is adding "http://site/index.php?main_page=index&cPath=3_10&sort=20a&products_id=12&action=buy_now&prod ucts_id=11" to the form action. Note the "double" inclusion of "products_id=". This can potentially cause issues depending upon how the web server handles the parameter being included twice.

Give me a few minutes and I'll work up a patch to the Zen Cart core code to fix the issue for you. And thank your patience!