Just a quick mention that I’ve upgraded to Movable Type 4.21. Please let me know if I broke anything.
I’ve already see one bug. While you’re writing, the system will autosave posts for you as you write. That’s cool and all that but after doing the save, it relocates the cursor to the beginning of the post content. So, if you’re not paying attention, you’ll wind up with your writing in the wrong place.
That really bugs me. 🙁
edit: Reported here.