With your Qty problem, could you take a look in the admin, under tools >> server info, and find out which version of PHP you are using? This is the same problem as is found here: http://www.zen-cart.com/forum/showthread.php?t=85724
Absolute
With your Qty problem, could you take a look in the admin, under tools >> server info, and find out which version of PHP you are using? This is the same problem as is found here: http://www.zen-cart.com/forum/showthread.php?t=85724
Absolute
Are you on a shared server, or a managed? Could you find out if they upgraded your PHP version on Jan 10th?
Absolute
trebor79 was good enough to let me access his site to find a solution for this problem.
The bug can be found here, along with a solution.
Absolute