Well, I deactivated all the woocommerce plugins (woocommerce, canada post, seo, invoice/packing) then reactivated them. I cleared all my caching in Firefox, Chrome and Safari - then tried it - but the issue still exists.
I also tried the Free Shipping suggestion and changed the 'free shipping requires' to N/A, but unfortunately, this too, did not work.
It seems like a lot of people are having this issue, yet I don't see anything in the WooCommerce forum about a solution. My ticket is still open after several days and no one has been assigned it yet.