Windows 7 : device is visible but connection failed

Hi guys.
I have a case where my device is visible but I do not have any web bluetooth button appearing in the Native IDE. Here is the console output:

We have chrome.serial - not using 'serialport' module
'winnus' module not found, no Windows Bluetooth Low Energy Error: The specified module could not be found. \\?\C:\Program Files\EspruinoIDE\node_modules\winnus\build\Release\winnus.node
serial_audio: Audio Sample rate : 44100
serial_audio: Audio Serial Baud 9600 Bit time 4.59375
Web Bluetooth available, but Windows Web Bluetooth is broken in <=56 - not using it
GET chrome.storage.sync = {"AUTO_SAVE_CODE":true,"BAUD_RATE":"9600","BLOCKLY_EXTENSIONS":"|bluetooth|robot|","BLOCKLY_LANGUAGE":"en","BLOCKLY_TO_JS":false,"BLUETOOTH_LOW_ENERGY":true,"BOARD_JSON_URL":"http://www.espruino.com/json","CODE":"console.log(\"Hello\");","COMPILATION":true,"COMPILATION_URL":"http://www.espruino.com:32766","ENABLE_Testing":false,"ENV_ON_CONNECT":true,"FONT_SIZE":12,"MINIFICATION_DeadCode":true,"MINIFICATION_LEVEL":"","MINIFICATION_Literal":true,"MINIFICATION_Mangle":true,"MINIFICATION_Unreachable":true,"MINIFICATION_Unused":true,"MODULE_AS_FUNCTION":false,"MODULE_EXTENSIONS":".min.js|.js","MODULE_MINIFICATION_LEVEL":"ESPRIMA","MODULE_URL":"http://www.espruino.com/modules","NPM_MODULES":false,"RESET_BEFORE_SEND":true,"SAVE_ON_SEND":0,"SERIAL_AUDIO":"0","SERIAL_TCPIP":"","SERIAL_THROTTLE_SEND":false,"SET_TIME_ON_WRITE":false,"SHOW_CODE_LINK_ICON":false,"SHOW_RELOAD_ICON":false,"SHOW_WEBCAM_ICON":0,"STORE_LINE_NUMBERS":true,"Sound_Error":"","Sound_Info":"","Sound_Success":"","Sound_Warning":"","Speak_Error":false,"Speak_Info":false,"Speak_Success":false,"Speak_Warning":false,"UI_MODE":"Normal","WEB_BLUETOOTH":false}
Initialising SettingsConsole
Initialising Utils
Initialising Config
Initialising Notifications
Initialising Status
Initialising App
Initialising File
Initialising Code
Initialising Serial
  - Initialising Serial Chrome Serial
  - Initialising Serial Chrome Socket
  - Initialising Serial Noble
  - Initialising Serial Audio
Initialising Terminal
Initialising CodeWriter
Initialising Modules
Initialising Env
Initialising Flasher
Initialising EditorBlockly
Initialising EditorJavaScript
Initialising Send
Initialising MenuPortSelector
Initialising MenuSettings
Initialising MenuFlasher
Initialising SettingsAbout
Initialising SettingsFlasher
Initialising BoardJSON
Initialising VersionChecker
Initialising Compiler
Initialising Assembler
Initialising GetGitHub
Initialising NPMModules
Initialising ExamplePlugin
Initialising Unicode
Initialising SaveOnSend
Initialising Minify
Initialising Tutorial
Initialising Webcam
Initialising FontSize
Initialising UiMode
Initialising URLHandler
Initialising CodeLink
Initialising Project
Initialising Testing
Initialising Notification_Sound
Initialising Tern
Initialising Debugger
Initialising Tour
Initialising SettingsProfile
Initialising HelpLinks
Loaded code from storage.
noble starting scan
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device:  f8:1a:18:1b:ba:f7
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device:  f8:1a:18:1b:ba:f7
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device:  f8:1a:18:1b:ba:f7
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device:  f8:1a:18:1b:ba:f7
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device:  f8:1a:18:1b:ba:f7
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device:  f8:1a:18:1b:ba:f7
Found device: jpthingy f8:1a:18:1b:ba:f5
Found device:  f8:1a:18:1b:ba:f7
Found device: jpthingy f8:1a:18:1b:ba:f5
noble stopping scan
noble starting scan

The device is a Nordic "Thingy" based on NRF52. I don't use Puck.js because I temporarily lost it . . .

I tried with both CSR and Broadcom based BLE dongles, same result. In both cases the IDE finds the device but when I select a port, no Bluetooth port appears. Check box Connect over Bluetooth Smart (BTLE) via 'noble' is checked. Espruino Native IDE version is win64_0v65.9. Any idea?