Installed 12.0.1 and Arduino 1.8.16 stoped working. It would get part way through launch when it disappeared. It would not get far enough to generate a report that I could send to Apple. (MacBook Pro with Intel processor.)
Going back to Big Sur was a major effort so I broke out an eight year old machine to do my work.
Hi @gbs46_sbcglobal.net. I'm sorry to hear about the trouble with the macOS update. In order to gather more information that might help us to troubleshoot your problem, I'm going to ask you to run the Arduino IDE from the command line, then share the output.
Please do this:
open Arduino
</> icon on the post composer toolbar. This will add the forum's code block markup (```) to your reply to make sure the output is correctly formatted.
By total serendipity everything seems to be working.
I do not recommend this to anybody but maybe to somebody with more knowledge they may gain some understanding.
From the Apple support site I found and option to reinstall the OS that originally came with the computer.
It started by saying, “Turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.” Then there were some options to follow.
This ground away for about fifteen minutes but did not work. There was some sort of cryptic error message that ended in 2100F. I tried a second time and got the same result.
At that point I abandoned work on my current computer and dug out an old computer. After I got the old computer working and down loaded my code from iCloud I posted my problem on the board.
I saw your response and welcomed the opportunity to help. I launched terminal and started following the instructions. However, I miss read about opening Arduino through terminal and double clicked on the Arduino icon in the dock. To my total surprise it launched normally and functioned normally.
Terminal was new to me. To satisfy my curiosity I did type “open Arduino” and got this message:
“The file /Users/my-name/Arduino does not exist.
my-name-MacBook-Pro-2:~ my-name$” (I am substituting “my-name” for my real name here.)
What the failed Command (⌘)-R attempts, or something else I did, accomplished is beyond me. But I am functional again.
Hello all.
Just for your info. I had many issues with Monterey 12.0.1/Mac Book Pro Intel 2017 and Arduino IDE 1.8.16. The Arduino compiler was anyway running in Monterey. But no way to have the serial monitor to detect the USB device (an MKR WiFi 1010) connected.
I then downgraded to Big Sur. And everything was again working.
I waited for a Monterey upgrade.
I've just installed Monterey 12.1.
Everything is now perfectly working again.
It has been a matter of waiting more or less one month to have Apple fixing their issue.
Cheers !
After reading your reply I had my hopes up, installing Monterey 12.1 would help me as well. Apparently not. 
Has somebody else experienced this and found a solution? Funny enough it worked last week when working with basically the same board. Is its possible it's due to some quality issues?
It's getting powered and everything, just no way to finally upload my sketch. 
Same issue here, even after update to the Monterey 12.1 ...
Which one? There were two completely different issues reported in this thread.
The original report was about the IDE not starting up at all:
It would get part way through launch when it disappeared
Then another report came months later about the unrelated problem something to do with the Serial Monitor:
no way to have the serial monitor to detect the USB device
I just brought home a new MBP that came with 12.2.1 on it. My old laptop failed to migrate so I started fresh, installed IDE and this new mac fails to find the USB path to any board connected to it.
Hoping someone finds a solution, I really want to continue the beginners courses and a project I have for TTGO board.
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