14.3 Mail.app - Corrupted/Garbled Text When Composing Messages

Guys, for what's it worth spent a week with Apple on this and the community figured it out before them (lost a week of my time). Two thoughts, I did turn off the Auto suggest in Keyboard (and does help a bit, does it get rid of it, it does not, but it kicks in a bit later in the text.

Next Hack, I compose my emails in Text Edit and then copy and paste since as you guys know once it gets garbled you are clicking in and out of the mail app to get it to correct and that is both annoying and time consuming, so writing in text edit does at least solve that. Don't waste your time on new user, plist any of that stuff, nothing helped. I am sure they will have a fix at some point. I have two other Mac minis with 14.2 as well so that does save me a bit. At least we know we are all not crazy :)

I am having the same problem with garbled text in Mail since switching to OS 14.3. I think my temporary solution will be to write long text messages in MS Word and then copy them into Mail until Apple corrects this problem, which I hope is soon.

APPLE HAS THE UPDATE!

FYI: After support escalating my issue to lead, who then took system logs and screen record of the problem and escalated to engineering -- that support lead called 3 days ago and asked for a more detailed system log. 3 days later we have the update.

This is why I suggested everyone do what I did. Once engineering gets enough validated evidence of the issue, especially a simple one like this, there aren't any good reasons left to not fix it.

I'm also guessing Tim Cook's staff had some WTF moments with this issue and it got escalated very quickly.

M2 Pro Mac Mini. Sonoma 14.3. Creating a new message in a window of its own. Not full screen. The text is getting cut, copied, and duplicated in very frustrating ways. Part of the text will disappear, part of it will be duplicated where your cursor is, and repeated Undo is the only way to get the disappeared part back, even though you also end up losing some of your last typing.

I am also seeing this on an M2 iPad Pro using Logitech Folio keyboard under iPad OS 17.3.

Same problem since updating to 14.3 on M2 MacBook Air. Hitting carriage return causes the display to corrupt. It generally updates the display I type something else, but only after a delay which scrambles the rest of the text.

Unfortunately, switching off predictive text, mentioned bye others, did not solve the problem for me. Also wondered if it was related to Display settings for text size, but apparently not.

First noted the problem in Apple Mail but extends to Scrivener, a word processing app which uses macos's native text tools. The problem does not seem to arise with Microsoft Word, for example. Also, I'm using Arc (Chrome-based browser) to write this, and no problem.

The issue is causing havoc for me. Really hope Apple escalates it.

Turning off / on inline predictions won't change anything. The problem seems related with text rendering / formatting as paragraphs are typed. If it's a one-liner type of response (being typed), probably no issues. When the text wraps a paragraph, that's usually the first thing to trigger it. Whether it's a new email vs replying to email (with text below the reply from the previous email exchanges) factors into the calculus somehow too.

Last week I said I was seeing it in Mail. Over the weekend, had the same issues in Safari when typing exchanges in user forums. Others have reported the same (in this post), so just adding my name to the list so to speak.

Some emails I receive on this post do not appear here, or like another poster, stated, I don't see it (they are all mangled). This was the most hopeful post I received yesterday, and I appreciated it. Google the below; maybe a link is not allowed here. Thanks, apmeyer, for the hopeful news!

apmeyer has posted in the Other Apple Applications and Services community. 

"Sounds like a fix is on the way. Can't come soon enough.

macOS 14.3 Sonoma Text Display Bug to Be Fixed Soon"

I just updated my computer to 14.3.1. I don't want to jinx anything here but I just wrote a long email and for me it seemed the problem is totally gone. Will see but I am hopeful this garbled text deal is behind us!

P.S. I've found that (on my iMac which is what I tried this on) *sometimes* when this happens in the mail composition window, I can by clicking (not in any random window, but rather) in the Apple Mail Viewer window (the main window of Apple Mail) and then clicking back in the composition window, cause the misrendering to go back to being a good rendering when the second click returns the focus to the composition window. Sometimes when that doesn't work, clicking back and forth between the two windows a few times fixes things. And sometimes it does not no matter how many times I try that. (The rich/plain text approach mentioned in this thread didn't work for me. And I suppose what I just suggested may not work for others... or for me the next times I try it. ;-})

Same. I just installed Sonoma (14.3) five days ago on a 2021 M1 iMac 24" and an M2 MacBook Air and noticed this immediately. Have been running in Safe Mode on the MacBook Air the last couple of days and haven’t noticed the problem but will stay in Safe Mode a little longer to see if it appears. But obviously, this needs a fix. 

On my Mac mini M1 I've seen this – infrequently – in Mail.app and Safari (when composing a long forum post). I don't use Notes, and I haven't seen it in any third-party app that presumably doesn't use Webkit. I'm sure the issue has appeared with macOS 14.3.

I haven't so far seen it on my 2015 Intel MacBook Pro. This is happily running 14.3, but with OpenCore Legacy Patcher, which I'm guessing adds an extra layer to the rendering process.

EVERYONE - the fix is out and it works. Check your software update.

Similar problems here. While typing a mail, some text gets replaced by fragments of previous text. And switches back. Annoying and unnerving. Brand new MacBook M3 Pro with Sonoma 14.3. Only observed it in Apple Mail until now.