I can say that nothing has changed for me in the MailClass that is being imported.

I can also say that in some instances Stamps.com is somehow importing or changing the package weights to something with 6 to 8 digits.

I thought that the shiprush app using Endicia would be more attractive but it was not as user friendly as Stamps.com implementation of ShipRush.

If there has been a software update, I haven't received any notice and haven't checked in either Stamps or the ShipRush addon.