[BUG] Unable to change wallpaper via GUI using swww after Hyprland 0.51.0 update (black screen)

[KlmeTea]

Describe the bug

Since the 0.51.0 Hyprland update, changing the wallpaper via the GUI causes a black screen.

Steps to reproduce

1. Open sidebar;
2. Open wallpaper app;
3. Change to swww;
4. Select any wallpaper.

Expected behavior

swww should change the wallpapers.

Screenshots

Distribution

Other (please specify below)

If Other, specify

Fedora 42

Additional context

Changing wallpapers with the swww CLI works fine.

Code of Conduct

• I agree to follow this project's Code of Conduct

[mylinuxforwork]

Can you check that swww is installed correctly by typing swww in the terminal?
If yes please open waypaper in a terminal and check the error message after selecting a wallpaper.

[KlmeTea]

Can you check that swww is installed correctly by typing swww in the terminal? If yes please open waypaper in a terminal and check the error message after selecting a wallpaper.

❯❯ /home/klme : swww
A Solution to your Wayland Wallpaper Woes

Usage: swww

Commands:
clear Fills the specified outputs with the given color
restore Restores the last displayed image on the specified outputs
clear-cache Clears the swww cache
img Sends an image (or animated gif) for the daemon to display
kill Kills the daemon
query Asks the daemon to print output information (names and dimensions)
help Print this message or the help of the given subcommand(s)

Options:
-h, --help Print help (see more with '--help')
-V, --version Print version

❯❯ /home/klme : waypaper
Selected file: /home/klme/.config/ml4w/wallpapers/Nocturne-of-Steel-and-Glass.jpg
Sent swww command to set Nocturne-of-Steel-and-Glass.jpg on All display

Executed "~/.config/hypr/scripts/wallpaper.sh "/home/klme/.config/ml4w/wallpapers/Nocturne-of-Steel-and-Glass.jpg"" post-command

error: invalid value '#ffffff' for '--fill-color <FILL_COLOR>': expected 6 or 8 characters in hexadecimal, found #ffffff

For more information, try '--help'.
:: Wallpaper Cache disabled
:: Setting wallpaper with source image /home/klme/.config/ml4w/wallpapers/Nocturne-of-Steel-and-Glass.jpg
:: Path of current wallpaper copied to /home/klme/.cache/ml4w/hyprland-dotfiles/current_wallpaper
:: Wallpaper Filename: Nocturne-of-Steel-and-Glass.jpg
:: Wallpaper effect is set to off
:: Execute matugen with /home/klme/.config/ml4w/wallpapers/Nocturne-of-Steel-and-Glass.jpg
ok

:: Theme: /ml4w-modern
:: Dock disabled
[2025-09-18 11:07:38.614] [info] Using configuration file /home/klme/.config/waybar/themes/ml4w-modern/config
[2025-09-18 11:07:38.614] [info] Including resource file: ~/.config/ml4w/settings/waybar-quicklinks.json
[2025-09-18 11:07:38.614] [info] Including resource file: ~/.config/waybar/modules.json
[2025-09-18 11:07:38.617] [info] Discovered appearance 'dark'
[2025-09-18 11:07:38.617] [info] Using CSS file /home/klme/.config/waybar/themes/ml4w-modern/colored/style.css
[2025-09-18 11:07:38.624] [info] Hyprland IPC starting
[2025-09-18 11:07:38.625] [info] Loading persistent workspaces from Waybar config
[2025-09-18 11:07:38.625] [info] Loading persistent workspaces from Hyprland workspace rules
[2025-09-18 11:07:38.626] [warning] 'swap-icon-label' must be a bool.
[2025-09-18 11:07:38.629] [warning] no bluetooth controller found
[2025-09-18 11:07:38.629] [warning] No batteries.
CSS reload success: true
:: Generate new cached wallpaper blur-50x30-off-Nocturne-of-Steel-and-Glass.jpg with blur 50x30
[2025-09-18 11:07:38.820] [info] Bar configured (width: 1920, height: 51) for output: DVI-D-1

(waybar:4011): Gtk-CRITICAL **: 11:07:38.829: gtk_widget_set_accel_path: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

(waybar:4011): Gtk-CRITICAL **: 11:07:38.829: gtk_widget_add_accelerator: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

(waybar:4011): Gtk-CRITICAL **: 11:07:38.830: gtk_widget_set_accel_path: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

(waybar:4011): Gtk-CRITICAL **: 11:07:38.830: gtk_widget_add_accelerator: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

(waybar:4011): Gtk-CRITICAL **: 11:07:38.831: gtk_widget_set_accel_path: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

(waybar:4011): Gtk-CRITICAL **: 11:07:38.831: gtk_widget_add_accelerator: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

(waybar:4011): Gtk-CRITICAL **: 11:07:38.831: gtk_widget_set_accel_path: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

(waybar:4011): Gtk-CRITICAL **: 11:07:38.831: gtk_widget_add_accelerator: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

(waybar:4011): Gtk-CRITICAL **: 11:07:38.841: gtk_widget_set_accel_path: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed

(waybar:4011): Gtk-CRITICAL **: 11:07:38.841: gtk_widget_add_accelerator: assertion 'GTK_IS_ACCEL_GROUP (accel_group)' failed
:: Resized to 75%
:: Blurred
:: Generate new cached wallpaper square-Nocturne-of-Steel-and-Glass.jpg

[KlmeTea]

I removed the # in line 9 at ~/.config/waypaper/config.ini , and it works.
This is just swww having changed after an update.😁