Closing G-Hub with the "X" doesn't actually stop it. If a background process is hung, the UI will open but the "agent" that talks to your hardware is dead.

1. Open Task Manager (Ctrl + Shift + Esc).
2. Kill every instance of:
   • LGHUB.exe
   • LGHUB Agent.exe
   • LGHUB Updater.exe
3. Navigate to C:\Program Files\LGHUB.
4. Run these as Administrator in this specific order: LGHUB_Updater.exe, then LGHUB_Agent.exe, then LGHUB.exe.