First of all, thanks for your reaction. In PS -ef several Arduino processes start-up.
Here is the dump after start-up in the terminal window:
"username@macbookpro ~ % /Applications/Arduino\ IDE.app/Contents/MacOS/Arduino\ IDE
Arduino IDE 2.3.4
Checking for frontend application configuration customizations. Module path: /Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/electron-main.js, destination 'package.json': /Applications/Arduino IDE.app/Contents/Resources/app/package.json
Setting 'theia.frontend.config.appVersion' application configuration value to: "2.3.4" (type of string)
Setting 'theia.frontend.config.cliVersion' application configuration value to: "1.1.1" (type of string)
Setting 'theia.frontend.config.buildDate' application configuration value to: "2024-12-03T10:01:12.470Z" (type of string)
Frontend application configuration after modifications: {"applicationName":"Arduino IDE","defaultTheme":{"light":"arduino-theme","dark":"arduino-theme-dark"},"defaultIconTheme":"none","electron":{"windowOptions":{}},"defaultLocale":"","validatePreferencesSchema":false,"preferences":{"window.title":"${rootName}${activeEditorShort}${appName}","files.autoSave":"afterDelay","editor.minimap.enabled":false,"editor.tabSize":2,"editor.scrollBeyondLastLine":false,"editor.quickSuggestions":{"other":false,"comments":false,"strings":false},"editor.maxTokenizationLineLength":500,"editor.bracketPairColorization.enabled":false,"breadcrumbs.enabled":false,"workbench.tree.renderIndentGuides":"none","explorer.compactFolders":false},"appVersion":"2.3.4","cliVersion":"1.1.1","buildDate":"2024-12-03T10:01:12.470Z"}
Starting backend process. PID: 15677
Using browser-only version of superagent in non-browser environment
Configuration directory URI: 'file:///Users/username/.arduinoIDE'
Configuring to accept webviews on '^.+\.webview\..+$' hostname.
2024-12-07T16:32:47.258Z root INFO Backend Object.initialize: 2.9 ms [Finished 0.648 s after backend start]
2024-12-07T16:32:47.261Z root INFO Backend Object.configure: 2.2 ms [Finished 0.648 s after backend start]
2024-12-07T16:32:47.261Z root INFO Backend s.onStart: 1.2 ms [Finished 0.648 s after backend start]
2024-12-07T16:32:47.261Z root INFO Backend s.configure: 0.3 ms [Finished 0.671 s after backend start]
2024-12-07T16:32:47.262Z root INFO Backend d.onStart: 0.2 ms [Finished 0.671 s after backend start]
2024-12-07T16:32:47.263Z root INFO Backend d.configure: 0.1 ms [Finished 0.672 s after backend start]
2024-12-07T16:32:47.263Z root INFO Backend d.initialize: 23.6 ms [Finished 0.672 s after backend start]
2024-12-07T16:32:47.263Z root INFO Backend c.onStart: 0.3 ms [Finished 0.672 s after backend start]
2024-12-07T16:32:47.264Z root INFO Backend a.configure: 2.5 ms [Finished 0.674 s after backend start]
2024-12-07T16:32:47.266Z config INFO >>> Initializing CLI configuration...
2024-12-07T16:32:47.266Z root INFO Backend c.initialize: 0.5 ms [Finished 0.675 s after backend start]
2024-12-07T16:32:47.266Z root INFO Backend x.onStart: 0.6 ms [Finished 0.675 s after backend start]
2024-12-07T16:32:47.266Z config INFO Loading CLI configuration from /Users/username/.arduinoIDE/arduino-cli.yaml...
2024-12-07T16:32:47.267Z daemon INFO Starting daemon from /Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/resources/arduino-cli...
2024-12-07T16:32:47.267Z root INFO Backend a.initialize: 0.5 ms [Finished 0.676 s after backend start]
2024-12-07T16:32:47.267Z root INFO Backend w.onStart: 1.1 ms [Finished 0.677 s after backend start]
2024-12-07T16:32:47.267Z root INFO Backend r.configure: 1.8 ms [Finished 0.677 s after backend start]
2024-12-07T16:32:47.267Z discovery-log INFO start
2024-12-07T16:32:47.267Z discovery-log INFO start new deferred
2024-12-07T16:32:47.267Z root INFO Backend d.initialize: 0.7 ms [Finished 0.678 s after backend start]
2024-12-07T16:32:47.267Z root INFO Backend y.onStart: 1.8 ms [Finished 0.679 s after backend start]
2024-12-07T16:32:47.267Z root INFO Backend r.configure: 1.4 ms [Finished 0.679 s after backend start]
2024-12-07T16:32:47.267Z root INFO Backend a.onStart: 0.4 ms [Finished 0.680 s after backend start]
2024-12-07T16:32:47.267Z root INFO Backend h.configure: 0.3 ms [Finished 0.680 s after backend start]
2024-12-07T16:32:47.267Z root INFO Backend s.configure: 0.1 ms [Finished 0.680 s after backend start]
2024-12-07T16:32:47.267Z root INFO Backend l.configure: 0.1 ms [Finished 0.680 s after backend start]
2024-12-07T16:32:47.269Z root INFO Theia app listening on http://127.0.0.1:60608.
2024-12-07T16:32:47.269Z root INFO Finished starting backend application: 2.1 ms [Finished 0.682 s after backend start]
2024-12-07T16:32:47.270Z root WARN The local plugin referenced by local-dir:/Users/username/.arduinoIDE/plugins does not exist.
2024-12-07T16:32:47.270Z root WARN The local plugin referenced by local-dir:/Users/username/.arduinoIDE/extensions does not exist.
2024-12-07T16:32:47.280Z config INFO Loaded CLI configuration: {"board_manager":{"additional_urls":["http://arduino.esp8266.com/stable/package_esp8266com_index.json"]},"build_cache":{"compilations_before_purge":10,"ttl":"720h0m0s"},"daemon":{"port":"50051"},"directories":{"builtin":{"libraries":"/Users/username/Library/Arduino15/libraries"},"data":"/Users/username/Library/Arduino15","downloads":"/Users/username/Library/Arduino15/staging","user":"/Users/username/Documents/Arduino"},"library":{"enable_unsafe_install":false},"locale":"en","logging":{"file":"","format":"text","level":"info"},"metrics":{"addr":":9090","enabled":true},"output":{"no_color":false},"sketch":{"always_export_binaries":false},"updater":{"enable_notification":true}}
2024-12-07T16:32:47.280Z config INFO 'directories.data' and 'directories.user' are set in the CLI configuration model.
2024-12-07T16:32:47.280Z config INFO Loaded the CLI configuration.
2024-12-07T16:32:47.294Z config INFO Mapped the CLI configuration: {"dataDirUri":"file:///Users/username/Library/Arduino15","sketchDirUri":"file:///Users/username/Documents/Arduino","additionalUrls":["http://arduino.esp8266.com/stable/package_esp8266com_index.json"],"network":"none","locale":"en"}
2024-12-07T16:32:47.294Z config INFO Validating the CLI configuration...
2024-12-07T16:32:47.295Z config INFO The CLI config is valid.
2024-12-07T16:32:47.295Z config INFO <<< Initialized the CLI configuration.
Restoring workspace roots: /Users/username/Library/Mobile Documents/com~apple~CloudDocs/Doc (iC)/Home (iC)/1_Projecten/5AL/AL 2024/Software/Test/TFT-2-8-Inch-Test/TFT-Touch-Graphicstest/TFT-Touch-Graphicstest.ino
isTempSketch: false. Input was /Users/username/Library/Mobile Documents/com~apple~CloudDocs/Doc (iC)/Home (iC)/1_Projecten/5AL/AL 2024/Software/Test/TFT-2-8-Inch-Test/TFT-Touch-Graphicstest/TFT-Touch-Graphicstest.ino
2024-12-07T16:32:47.316Z root INFO Resolve plugins list: 50.1 ms [Finished 0.729 s after backend start]
2024-12-07T16:32:47.449Z daemon INFO time="2024-12-07T17:32:47+01:00" level=info msg="arduino-cli version 1.1.1"
time="2024-12-07T17:32:47+01:00" level=info msg="Using config file: /Users/username/.arduinoIDE/arduino-cli.yaml"
time="2024-12-07T17:32:47+01:00" level=info msg="Executing `arduino-cli daemon`"
Daemon is now listening on 127.0.0.1:60612
{"IP":"127.0.0.1","Port":"60612"}
2024-12-07T16:32:47.450Z daemon INFO Daemon is running.
2024-12-07T16:32:47.791Z root ERROR Uncaught Exception: Error: 14 UNAVAILABLE: read ECONNRESET
2024-12-07T16:32:47.791Z root ERROR Error: 14 UNAVAILABLE: read ECONNRESET
at t.callErrorFromStatus (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:921584)
at Object.onReceiveStatus (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:946900)
at Object.onReceiveStatus (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:942780)
at Object.onReceiveStatus (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:942225)
at /Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:1028347
at process.processTicksAndRejections (node:internal/process/task_queues:77:11)
for call at
at s.makeUnaryRequest (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:946441)
at s.create (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:1013244)
at instance (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:776525)
at new Promise (<anonymous>)
at v.createClient (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:776502)
at v.create (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:775410)
at /Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:774306
at /Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:1220936
at i.invoke (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:1221026)
at s.fire (/Applications/Arduino IDE.app/Contents/Resources/app/lib/backend/main.js:2:1222829)
2024-12-07T16:32:48.624Z root INFO Deploy plugins list: 50.1 ms [Finished 2.038 s after backend start]
Opening channel for service path '/services/electron-window'.
Opening channel for service path '/services/ide-updater'.
"