After doing some deeper reading, I found a post that goes back to the end of October of 2017 which states a seller noticed this problem start mid-October. This is not official, mind you. Sellers on the French side of ebay Canada had been complaining of a problem similar to this since the summer. Are they all the same problem? Different problems? Are some user-generated problems? We don't know.
Another thing I don't know is the reason this is taking as long to fix as it has been broken. Calculated Shipping is a fundamental tool for ebay.ca sellers.
Workaround options? Tell your buyers to Add to Cart to check postage costs for Fixed Price listings, or remove Air Parcel service from Auctions to see the other postage costs displayed properly for USA and international destinations.
I can tell you, however, that if you attempt to (temporarily) remove Air Parcel from listings as a workaround, please take note that doing so via Bulk Edit will not actually save the changes.
This is a bug with the Bulk Editor; I've experienced this phenomena in the past with bulk editor bulk changes to international postage options, you can make the changes but they won't take. (It's been like this for probably two to three years, luckily I have few reasons to do a massive bulk edit of that field of data.) You have to make the changes via old fashioned Revise Item one at a time, or using Bulk Editor but selecting the items One at a Time. Of course, if you have items of varying sizes/valued selected, you might want to do it that way anyway.
Either way, it presents a very time-consuming workaround, and one that is not ideal if you rely on sales to countries served only by Air Parcel. And one you'd need to undo when the Shipping Calculator is fixed.
For now, I'm removing Air Parcel service from my Auctions only, as Add to Cart for Buy It Now (BIN) format listings shows postage as it should for international buyers looking to purchase BIN items. My business model doesn't rely on Auctions, they are mostly an after-thought here. And, as I've stated earlier, my outside-Canada sales don't seem to be affected by this problem as significant as it is, since I use Buy It Nows and Good Till Cancelled listings. Oddly, my domestic sales are the ones that have done a steep decline in recent weeks but those are not affected by the glitch. That drop in domestic sales does, however, occur periodically in my category. If the problem truly began in October, it didn't affect my toy sales over the holiday at all.
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