@mattdjuk This could be something (clutching at straws a bit here)...
I was just looking in the cookies, I see these:
Screenshot 2022-05-26 113221.png
It has 2 express.sid cookies
1 is for forum.$$$$$$$.co.uk and the other is for .$$$$$$$.co.uk
https://github.com/NodeBB/nodebb-plugin-question-and-answer/tree/master/static/languages seems some of the language keys are wrong here, not sure how that effects this issue though.
The issue with question and answer plugin folder name is fixed here https://github.com/NodeBB/nodebb-plugin-question-and-answer/commit/e6f9752e35fa46e15d88943bd107b6d0f538b3dd
New version 0.8.3