Thanks for the quick reply!
Turning on just Logging and Debug doesn’t provide much info (the Shipping and Taxes logs are empty and the Other Log is just displaying info about when logging and debug were enabled), also no info is displayed on the Cart and Checkout page.
Turning on Debug Mode from Settings -> Shipping -> Shipping Options (plus the above mentioned debug options from WooCommerce Services) is displaying info on the Cart page, but this is not helping me in finding the cause of this “Unexpected server error” on the plugin’s page (when trying to update the USPS (WooCommerce Services) shipping method).
Regarding the other issue, the Store Address is complete and I have only one Zone (US). Also, the issue I encountered is on the Cart page (when the shipping address is not yet known). Again, this is not happening all the time – sometimes I can see the shipping price and sometimes I’m getting the “There are no shipping methods available. Please ensure that your address has been entered correctly, or contact us if you need any help.” notice. What’s strange is when I’m immediately enabling the debug mode and refresh the Cart page, I’m seeing the shipping options just fine. That happened all the times so I don’t have any info about why could cause this behavior.
Is there something else I could check to get to the bottom of this issue? I want to remove some First-Class Mail and Priority Mail services. As a temporary solution, could I do that directly in the database? If so, could you give some details?
Thanks!