@gwr You would have been welcome to ping me sooner to remind me to response, im sworry it took a week. I totally missed your message. I get a lot of messages and sometimes a few get lost in all the noise.
Also if you ever need support our entire team is better reached via Matrix. We have about a 15 person team here, and any development activity can be seen from there.
So the latex and markdown we know, and its unrelated to QOTO directly. Long story short the engine that makes that possible (MathJax) has a CSP related bug and anyone using that tool anywhere has it broken now on browsers it seems. That wont be able to be fixed until they fix it upstream. Though we are lookinginto Katex.
The issue you have with favorite domains and subscribing.. what exactly are the symptoms? As far as I know those should be working, if they arent this is the first im hearing of it.