UPDATE #1 December 7
Larian Studios has provided the first Hotfix for the big patch v18.104.22.1685 that broke the game for many people, and will address at least a few of the "most urgent problems" people are now having with the game, most notably with the hotbar. Here's what Larian had to say:
"In our enthusiasm to get as many issues fixed as we could in our latest patch, a bug slipped through the net! This hotfix should address the most urgent problems, but we will continue to look into your feedback on the patch.
Don't forget to report any issue here on the forums, or contact our support via firstname.lastname@example.org and we will do our best to get critical problems out of the way as soon as possible."
I think they're joking about the singular "a bug" part. We've got the full Patch Notes for Divinity Original Sin 2 here, but as we're nice and the Hotfix is only for a few issues here are the things Larian have corrected so far:
At least that's the hotbar one sorted out. Hopefully the rest will be fixed in due course.
Yesterday, a massive patch dropped on Divinity: Original Sin 2. Unfortunately, it seems to have broken the game more than fixed it.
Okay, that's hyperbole -- it fixed a boatload of stuff, but it did broke some others quite severely. Specifically, the hotbar, the skills, the journal, the health bar, the abilities, a couple of scrolls, and most weapons. Phew.
As several threads on Reddit indicate, the latest patch from Larian Studios introduced several new issues that were previously nonexistent. Besides technical issues like characters not fully healing, more severe bugs are cropping their heads up, like the game crashing to desktop when opening the journal.
One of the most hard-hitting bugs, however, prevents players from using the hotbar. Given Divinity is an old-school RPG, the hotbar is virtually the most important element of the UI -- without it, players are unable to cast spells, read scrolls, use items, or even fire arrows. As a result, Divinity 2 is currently unplayable for some.
Hopefully, this is all rather temporary. Larian is a capable developer and clearly cares about their products, so it's hard to imagine they are not running around like headless rabbits fixing the game as we speak. We'll update this as it develops.