Taxes - Not Applied When State Abbreviated

I am having a problem with my store with taxes not being applied occassionally. My store is in California, US. I have:

Tax Classes
Taxable Goods

Zone Definitions - Taxes, Payment and Shipping
Zone Name = California

Tax Rates
Tax Class = Taxable Goods
Zone = California
Tax Rate = 7.7500

Basis of Product Tax = Billing

Occasionally a California order will come through without charging tax. I looked at the orders and found that the tax is not being charged when the billing state is abbreviated on the order (instead of being spelled out completely (CA vs California).

Below is an example of a California order where no tax was charged:

Sub-Total: $16.96
Standard Shipping Rate (7-10 Days): $4.00
Total: $20.96

Customer:
Cxxxxxxx Wxxx
1885 The Alameda Suite 131
San Jose, California 95126
United States

Shipping Address:
Cxxxxxxx Wxxx
1885 The Alameda Suite 131
San Jose, California 95126
United States

Billing Address:
Cxxxxxxx Wxxx
918 South 9th Street
San Jose, CA 95112
United States

Below is an example of an order where tax was charged:

Sub-Total: $15.00
Standard Shipping Rate (7-10 Days): $4.00
CA TAX 7.75%: $1.16
Total: $20.16

Customer:
Xxxx Xxxx
370 S. Silverbrook Dr.
Anaheim Hills, California 92807
United States

Shipping Address:
Xxxx Xxxx
255 Portofino Way, #22
Redondo Beach, CA 90277
United States

Billing Address:
Xxxx Xxxx
370 S. Silverbrook Dr.
Anaheim Hills, California 92807
United States

I noticed that orders that are saved with the State Abbreviated do not get tax applied to them. How are the state abbreviations controlled? Can I remedy this?

Thanks for your support,

Pic

The upcoming bugfix release will fix the case where zones are not properly set when a customer supplies a "different" address during the checkout process, thus causing taxes to not be levied.

Great, I will look forward to it.