After upgrading from 1.1.6, I received a notice that the database was being migrated? I let it finish its thing, but since then, MailCommander would no longer send mail. In fact, many of the times, all my setup appeared blank (e.g. items in inventory that can be sent to alts). The other day, my settings regarding items being sent to which characters returned, but whenever I click the "Send All" button, the recipient field gets changed to "working" and nothing happens.

I figured since a migration of settings was mentioned, there may have been an overhaul, so I bit the bullet and reset all of my settings. Now I have a fresh, blank profile. However, every time I log into a new character, that character is not added to the list of alts. I also tried manually adding characters, which doesn't work either. (Characters are on same account, same realm, same faction, above level 30, etc.)

I am currently running v2.0.2 from Curseforge.

I just tried deleting the addon folder and manually installing from Github, but it was missing the libs folder. Deleted addon folder again and manually downloaded from Curseforge, but bad behavior still persists.

Can you enable lua error and see if something is logged?

I do have Lua errors enabled, but haven't been getting any.