The Windows version of iFly EFB is mostly used for planning at a desk, and its problems are mostly Windows problems: display scaling, graphics drivers and installer permissions. Each of the four below has a known fix.

The app does not fit the screen, or opens tiny

On high-resolution or multi-monitor setups the app can open smaller than the screen, or larger than it. In iFly go to Menu › Setup › Screen Settings, enable Windowed mode, and a resolution option appears; pick one that matches your monitor. If you cannot reach the menu, drag the window to your main monitor first.

Black window that says "iFly EFB loading…" and never finishes, or graphics glitches

On some newer Intel graphics chips (Iris Xe in particular) the Windows graphics driver mishandles hardware acceleration. Telling Windows to render the app in software fixes it:

1. Press Windows + R, type regedit and press Enter.
2. Go to HKEY_CURRENT_USER\SOFTWARE\Microsoft\Avalon.Graphics. Create the Avalon.Graphics key if it does not exist.
3. Inside it, create a new DWORD (32-bit) value named DisableHWAcceleration and set it to 1.
4. Restart iFly.

This affects other apps built on the same Windows framework, so if you notice something else slow down, set the value back to 0.

Endless "Could not set file security for file …\Config.Msi\…" dialogs at start-up

This is the Windows Installer re-running every time the app starts, usually because it was installed on a secondary drive (E:, D:) with different permissions, or because the desktop shortcut created by the installer points at the installer rather than the app.

1. Uninstall iFly EFB completely and delete any leftover iFly folders.
2. Reboot.
3. Download a fresh copy from iflyefb.com/WindowsDownload and install it to the default location on C:.
4. If the dialogs come back, delete the desktop shortcut and make a new one yourself: find iFlyEFB.exe in File Explorer, right-click it, Send to › Desktop (create shortcut). Starting from that shortcut bypasses the installer check.

No sound

Go to Menu › Setup › Screen / Audio › Sound Setting, drag the level down from 100% and back up to 100%. That re-initialises audio output. Check the Windows volume and that the output device is right. (The same trick works on tablets; make sure the ringer switch is not muted on an iPad.)