Blank Delivery address for some PayPal Express orders

Hello,
I am on version 1.5.6, upgraded from a previous version, I think it was 1.5.5e.

For some orders, the Delivery address comes through blank. (This only applies to PayPal Express orders. PayPal Pro orders do not have this problem)

Has anyone else encountered this?
(It is intermittent. And if I go look at the PayPal transaction, I see the shipping address clearly in there)

Thanks,
Shawn

Are some of the items identified as virtual product, electronic downloads, the like?

Are you showing that the same product that is purhased using PayPal Express was also purchased with PayPal Pro and in both cases there is no extra product with one as compared to the other?

Is it specifically ZC 1.5.6 or one of the three sub-versions currently released?