In Sunshop 3.5, the 'Update Cart' button clears out my cart!

I think this has to do with php and global variables, but I'm not sure. 

In any case, the fix that I used is in the globals.php .  There's a branch like this:

// ###################### update cart #######################
if ($action == "updatecart") {

In there you will see a line:

$tmp = $item[$i];

 Comment that line out, and put in this line:

$tmp = $_REQUEST['item'][$i];