USPS Shipping Mod Problems

I have a new install 1.4.9.3 I just did a test purchase and went through check out. First off the item I was testing would be shipped media mail mail which is checked in admin. this is what the shipping looks like in the cart

1 x Vintage Knit o Graf New Styles Catalog 54

Sub-Total: $4.99
Media Mail^®: $3.55
Total: $8.54
View Cart | Checkout

I don't think the code should be showing

I chose media mail for this item because first class mail option is missing at check out but is checked in the mod in admin. What is the problem? Your help is appreciated.
Thank you

USPS changed their servers in anticipation of an API update in May. They shouldn't have, but whatever -- here's a fix:

http://forum.opencart.com/viewtopic.php ... 28#p123964

Hi thanks Johnathan for the post. The patch cured the code issue in the cart but still didn't give me the first class shipping option in checkout even though it is checked in admin usps mod. I need to get the shipping option working because I ship small light weight things.
Thank you.

First-Class will only show up for items 13 oz and under. The usual culprit for issues regarding it is improper product weights. Double-check that you have those, and your system weight class and USPS weight class, set up properly.

I have a client that ships many low weight items as well, and I am getting First Class options for shipping, so this may very well be the way you have weights set up in the back end. HOWEVER, once you do get the weights straightened out, if you have any items that weigh under 3.5 ounces, you're going to run into another problem--the USPS seems to feel the need to offer First Class Postcards as a shipping option.

I have a thread opened about this here: http://forum.opencart.com/viewtopic.php?f=114&t=25532