I sell only on eBay.COM and I can access and print my Buyer invoice in USD when I am on eBay.CA.
Try signing in to eBay.CA and go to your completed items and check the "view order details" of an item that you sold from eBay.COM.
tyler@ebay
It's working for me..... and I'm wondering why the change?
Also, I don't know if I can send a USD invoice from eBay.CA yet until I get a sale.