Ah I am on 83.9, but obtainium says it's up to date. What link are you using in obtainium? 

It's been crashing when I select the person I want to tag, before posting the note  

 I'm using https://github.com/vitorpamplona/amethyst/releases in obtainium.

Something doesn't seem right there.

https://i.nostr.build/GqeV.jpg