Hi--I am on a macbook pro and as recently as a few weeks back, I was able to use the Arduino app. However, today I tried to open it, and while the initial window pops up and goes through "Initializing Packages" and "Starting", the app never opens after that.
I am on macOS 11.4 (Big Sur) (which admittedly updated fully today, but I was on an earlier version of Big Sur a few weeks back, and Arduino ran fine). I've tried a few different version of Arduino at this point:
--Arduino IDE 2.0.0 beta (this had a different result--see below)
I've updated my Java and JDK. I've tried to follow the steps in this thread below, but I don't even find the file that is suggested to be edited. I've tried emptying out the contents of the Arduino15 folder (except preferences.txt). I've restarted my computer multiple times.
NOTHING WORKS! Each time I just get the attempted startup, and then nothing. The only thing that sort of comes close to opening the app is going into the packages folder and clicking on the MacOS Arduino Unix executable file (which launches the terminal). Then a few of my recent sketches open up in arduino, but I can't open anything else.
For Arduino IDE, when I open that, I keep getting just one sketch file opening, and I can't create or open another in the same app.
Help? I'm not a sophisticated user, so please if you have any advice, make it really basic and step-by-step. I know I can use the online version, but I really would like to get the app to work on my mac.
(PS I have the same conditions on my other MacBook pro--same OS, updated Java, Arduino 1.8.13, and it all works fine. Not sure what the difference is here!!)