Ended up uploading the most recent USPS_default extension and calling the USPS on the telephone. The person I spoke to changed my settings and it now works...but only for USPS Priority Mail--not First Class parcels. Decided to offer Flat Rate shipping also, and will ship First Class when people make that selection. (I sell tee shirts, so they don't weight much!)

I did upgrades through version 1.9 (manually) but the admin screen still shows I'm running Ver. 1.5. Since the website seems to be running fine--and the USPS extension now works--I am not attempting further updates.

Thanks so much. Issue resolved! 

Mine is agilitees.com

I have been testing the checkout section of my cart. The "Guest Checkout" works fine. However, when I try to use "Register Account" and fill out all required fields, there is no "Continue" button, so I can't complete the registration. (I am not requiring customers to agree to terms.) What could I be doing wrong?
Thank you!

After too many years, I have thrown in the towel on Zen Cart and have decided to give AbanteCart a try. So far, I'm finding it so much easier to navagate, but I have run into a little problem that I hope someone can assist me with. I am a tee shirt printer and need to set up my store so people can order shirts in various sizes and colors. At first, I set things up in the Global Attributes to use multiselectboxes. However, as I input products and played with various options, I decided to change to checkboxgroups instead. I switched to checkboxgroups in the "Attribute Type" dropdown field in the Global Attributies section (and saved my changes), but the product pages still displayed the multiselect boxes. Today, I added two new color choices in the Global Attributes. To my surprise, the shirts with the "new" colors display checkboxes on their product pages. However, my earlier products are still displaying multiselect boxes.  (My husband, who is a long-time software engineer, thanks that perhaps the php files are not being re-rendered when changes are made to the Global Attributes.) Can anyone help me with this?
Huge Thanks!