I'm unable to prepare or unprepare any spells without refreshing the page in my browser.  Once I refresh the page, my change takes effect.  I've tested on my Artificer and Cleric, and they behave normally, so I'm reasonably certain it's only wizards.  

I cleared my cookies and also tried it in incognito mode in Chrome, same thing.  Tested in Firefox (a browser I've never used to log into DNDBeyond before), same behavior.  I also asked a friend who also has a wizard to try it on mobile, same behavior.

EDIT: The Mobile App seems unaffected and behaves normally.

 Can confirm, using Firefox on Win10.

Both in the character builder Class page, and on the character sheet under Manage Spells. In the Wizard - Spellbook section, clicking a Prepare/Unprepare button shows no change until you reload the page. This also happens in the Wizard Prepared Spells section, with the Unprepare button, but the Remove Spell button does work. The Add Spells section works fine. Other classes work fine (I tested with Rogue - Arcane Trickster and Artificer.)

So I'm trying to make a bladesinger wizard but I can't prepare the spells in my spellbook. And when I went to view the character, it just auto-prepared 4 spells but they weren't the spells I want. I went back to the editor and now only two spells are prepared and I can't unprepare them/prepare more. It's rather frustrating.

I have a wizard using chronurgy magic that is also having the same error. I can only remove the spells, not unprepare or prepare them. Some of them also do not show up at all in my character sheet (but do on my spellbook). Perhaps there is a wizard bug going around?

Actually, I don't know if this helps you, but I saw a few posts saying that Wizard spells are busted right now on every browser except for mobile. I downloaded the app, and I WAS able to prepare my spells from there. Can't do it on browser, but there's at least a work around for now to get your character sheet up and running. 

Hi there, just wanted to verify that I too am having this issue. Tested on Chrome and Edge.

It's happening again to my wizard character I am building for my campaign. Some spells seem to work but other's don't - they just come up as "known."

Please post a link to your character sheet so someone can look into this for you.

https://www.dndbeyond.com/sheet-pdfs/shkelqimhkadriu_111207026.pdf

Not the PDF, the actual URL for the actual character sheet. Nobody can help you from the PDF.

https://www.dndbeyond.com/characters/111207026/kU5ZzY

Until a Mod comes and helps you, here’s a short vid that might help:

I know this already, appreciate you trying.

Still not fixed, it's the same issues for my wizard characters.

I'm seeing the three 1st level spells your character knows as able to be prepared:

Clicking the prepare button works for each of them.

As an aside, your character should know 6 first level spells, not 3, as a first level wizard

That's really strange, they still won't come up on my site (even the prepare button and all is not there) I will post a picture afterwards.

EDIT: SOLVED