[ic] No Shipping Charges -- What happens if UPS lookup fails?

[Matt Kerner]

We have a couple of orders in a store (sequentially) that did not have 
shipping charged.  Our only shipping methods are UPS items (ground, 
next day, two day, three day).

One of the items shows a shipping method of () and the other of NsNu() 
both with a charge of $0.00.

What would cause such an error?  There are no errors related to these 
orders in either the catalog error log or the system error log.

The only thing that occurs to me is that the UPS lookup failed and 
nothing was charged.  Is this possible?  What should happen?

Has anybody else seen this type of behavior?

Thanks,
Kerner