Spellcheck not working

Hey y’all. I can’t get the spellcheck to work. I have set it to a language, but even so it won’t spell check my emails. Any ideas about what I am doing wrong? The below is just a screenshot of my email with misspelt words and no red underlines.

Shared with CloudApp

See here Mailspring & Spellcheck not...

On Windows 10, Mailspring version 1.10.8 spell check only works when composing or replying in plain text
On linux (Ubuntu MATE) Mailspring version 1.10.8 spell check works with rich text.

Why?