I've configured this module as follows:
Shipping from address is located in the United States (Ohio).
Ship From address is residential - False
Ship To address is residential - True
Pickup type - 1 or 3 - Doesn't matter
Enable International Priority - True
Enable International Economy - True
Enable International Ground - True
Enable Saturday Delivery - True
International Ground Handling Fee - Doesn't matter
International Express Handling Fee - Doesn't matter
No tax class
Signature Option -1
Insurance -1
FedEx Rates - Account
Show Estimated Transit Time - False
Shipping zone - None
Sort Order - 0

I'm experiencing the following issues with this module. (Testing this on a Sunday):
1. International Priority rates do not show to Canada even though they are enabled. Economy and Ground show fine.
2. Shipping to Australia - No options show.
3. I've also noticed if I "Show Estimated Transit Time" as true no shipping methods show to Canada or Australia today. United States rates show fine.

For Australia I'm testing with: Sippy Downs QLD 4556
For Canada I'm testing with: Kenora, ON P9N 2X9 and CALGARY, AB T3K1L5

FedEx Web Services is still working properly when installed side by side. All rates are showing with postal codes.