@jackie: Thanks, it's not actually a sync problem. What happens is that when you go back to the previously opened editor, the cursor position remains the same as it was before, which means no sync request is sent causing the preview to remain at the top of the file. I'll look into the best solution for that, that is not too inefficient. Feel free to delete the file.
@Katsunami: Shortcut changes no longer require a restart. Update to the last beta I posted. And as I mentioned previously (to arspr, I think), a TOC View is on my todo list.
EDIT: Fixed:
https://github.com/kovidgoyal/calibr...808259a5388f7d