[Bug] Millennium 3.0.0-beta18 won't show up after a Steam restart

[Marocco2]

Before Reporting

• I found no existing issues matching my bug
• My issue is not caused by a theme
• My issue is not caused by a plugin

Describe the Bug

Millennium often fails to load after a Steam restart following updating or installing Millennium.
Logs may indicate that it loads correctly but it won't show up on Steam

Expected Behavior

Millennium should start correctly

Steps To Reproduce

After an installation, restart Steam until it won't load (not 100% accurate)

Operating System

Windows

Anything else?

Millennium logs:

[53:24.912] INFO Millennium-x86_64@v3.0.0-beta.18 attached...
[53:24.917] INFO Waiting for Steam UI to load...
[2026-04-04 22:53:24] Startup - updater built Mar 12 2026 18:49:28
[2026-04-04 22:53:24] Startup - Steam Client launched with: "C:\Program Files (x86)\Steam\steam.exe" -dev
[2026-04-04 22:53:24] Windows 10.0.26200.0, 0, 2, 256, 1, 121
[2026-04-04 22:53:24] Using the following download hosts for Public, Realm steamglobal
[2026-04-04 22:53:24] 1. https://client-update.akamai.steamstatic.com, /, Realm 'steamglobal', weight was 400, source = 'update_hosts_cached.vdf'
[2026-04-04 22:53:24] 2. https://client-update.fastly.steamstatic.com, /, Realm 'steamglobal', weight was 900, source = 'update_hosts_cached.vdf'
[2026-04-04 22:53:24] 3. https://client-update.steamstatic.com, /, Realm 'steamglobal', weight was 1, source = 'baked in'
[2026-04-04 22:53:24] Verifica dell'installazione...
[2026-04-04 22:53:24] Verifying file sizes only
[2026-04-04 22:53:24] Verification complete
[53:24.985] INFO Setting up hooks for tier0_s.dll
[53:25.022] INFO [dll_notification_callback] Notified that Steam UI has loaded, notifying main thread...
[53:25.022] INFO Steam UI loaded in 104 ms, continuing Millennium startup...

Steam logging initialized: directory: C:\Program Files (x86)\Steam\logs

[53:25.099] INFO Initializing plugin_loader...
[53:25.109] INFO No themes to update!
[53:25.109] INFO No themes or plugins to update!
[53:25.120] INFO Registering for load event @ 0x5c361ff738
[53:25.121] INFO Enabled Plugins: 0, Loaded Plugins : 0
[53:25.121] INFO Finished preparing backends: none failed, none successful
[53:25.121] INFO Invoking & removing on load event @ 0x240a5b3ccd0
[53:25.121] INFO __backend_load was called!
[53:25.121] INFO Plat_HookedCreateSimpleProcess called!
[53:25.121] INFO No queued shim loader found...
[53:25.121] INFO Checking for updates on beta channel...
[53:25.268] INFO Plat_HookedCreateSimpleProcess called!
[53:25.268] INFO [CDPShim] Final command: "C:\Program Files (x86)\Steam\bin\cef\cef.win64\steamwebhelper.exe" "--remote-debugging-io-pipes=1352,1372" --remote-debugging-pipe "--remote-debugging-port=8080" "--remote-debugging-address=127.0.0.1" "--remote-allow-origins=*" --enable-unsafe-extension-debugging -nocrashdialog "-lang=it_IT" "-cachedir=C:\Users\maroc\AppData\Local\Steam\htmlcache" "-steampid=15344" "-buildid=1773426488" "-steamid=0" "-logdir=C:\Program Files (x86)\Steam\logs" "-uimode=7" "-startcount=0" "-steamuniverse=Public" "-realm=Global" "-clientui=C:\Program Files (x86)\Steam\clientui" "-steampath=C:\Program Files (x86)\Steam\steam.exe" "-launcher=0" -dev --valve-enable-site-isolation --enable-smooth-scrolling --ignore-gpu-blocklist "--log-file=C:\Program Files (x86)\Steam\logs\cef_log.txt" --disable-quick-menu --disable-component-update "--gaia-url=http://disabled.invalid" "--enable-features=PlatformHEVCDecoderSupport" "--disable-features=WinRetrieveSuggestionsOnlyOnDemand,SpareRendererForSitePerProcess,DcheckIsFatal,BlockPromptsIfIgnoredOften,ValveFFmpegAllowLowDelayHEVC"
[53:25.349] INFO Latest Millennium release: v3.0.0-beta.18
[53:25.349] INFO Millennium is up to date.
[53:25.352] INFO No Millennium updates available.
[53:25.355] INFO Plugins: {  }
[53:25.355] INFO Starting frontend socket...
[53:25.356] INFO [CEFBrowser] CDP pipe transport connected.
[53:25.356] INFO Starting webkit world manager...
[53:25.357] INFO Connected to Steam devtools protocol...
[53:55.580] ERROR webkit_world_mgr: failed to enable target discovery: Request timeout
[53:55.580] * FUNCTION: void __cdecl webkit_world_mgr::initialize(void)
[53:55.584] * LOCATION: https://github.com/SteamClientHomebrew/Millennium/blob/8f8bbb2b9a58af8cc7037880ffe1ca715878f0a9D:/a/Millennium/Millennium/src/engine/plugin_webkit_world_mgr.cc#L74
[53:55.584] INFO ThreadPool worker exception: Request timeout
[53:55.584] INFO ThreadPool worker exception: Request timeout

SharedJSContext:

library.js:2 Storing new config params ?LOCAL_HOSTNAME=xxxxxxx&LANGUAGE=italian&COUNTRY=IT&LAUNCHER_TYPE=0&CLIENT_SESSION=xxxxxxxxxx&IN_CLIENT=true&USE_POPUPS=true&IN_STEAMUI_SHARED_CONTEXT=true&PLATFORM=windows&DEV_MODE=true&SHOW_CONSOLE=true
library.js:2 setting locale: it
/favicon.ico:1 
        
        
       Failed to load resource: the server responded with a status of 404 (Not Found)
library.js:2 websocket open
library.js:2 websocket open
library.js:2 connection ready
library.js:2 connection ready
library.js:2 Connection status: connected
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamApp Init - WebUI Transport - 475,6ms
library.js:2 font-family: monospace; background: black; color: white; font-weight: normal; padding: 0 1ch; border: solid 1px #666
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 Init localization italian
library.js:2 OnLoginStateChange  0 1 0 0
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamApp Init - Before Login - 99,6ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamAppInit - ControllerStore - 64,6ms
library.js:2 OnLoginStateChange atrip3 2 1 0 0
library.js:2 OnLoginStateChange atrip3 3 1 0 0
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SetOOBEComplete
SetOOBEComplete @ chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1
library.js:2 OnLoginStateChange atrip3 4 1 0 0
library.js:2 OnLoginStateChange atrip3 4 1 2 -1
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 Init localization italian
library.js:2 OnLoginStateChange atrip3 5 1 0 0
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 CloudStorage resuming with 216 entries (0 modified) for namespace 1
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 CloudStorage resuming with 13 entries (0 modified) for namespace 3
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 Updated Steam Version Info: {"nSteamVersion":1773426488,"sSteamAPI":"SteamClient023","sSteamBuildDate":"Mar 12 2026 18:50:10","sOSCodename":"","sOSVersionId":"10.0.26200.0","sOSVariantId":"121","sOSBuildId":"","sBIOSVersion":"unknown"}
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamApp Init - After Login - Stage 1 - 270,3ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 CAppStore Init: 503.14013671875 ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamApp Init - AppStore - 503,6ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamApp Init - After Login - Friend Store - 6ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamApp Init - After Login - Collection Store - 94,8ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 CUIStore Init: 25.566162109375 ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 Preloading Game Rich Presence for AppIDs: Array(1)
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 Loading batch of App Info from Steam:  Array(4)
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamApp Init - After Login - Stage 2 - 366,3ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamApp Init - After Login: 1242.171142578125 ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 SteamApp Init: 1006.659912109375 ms
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 FriendStore.ForceReadyToRender() - Initial app info not ready
ForceReadyToRender @ chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1
chunk~2dcc5aaf7.js?contenthash=ae5282862f4ad974d0f2:1 FriendsUI ReadyToRender - 2.402ms

[BeardedLadyTina]

Having the same issue here with versions 2.34.0 , 2.35.0 , and 2.36.0-beta.1 . Running the code that's supposed to generate Millennium logs doesn't produce any (unless they're hidden in some random folder). Some of the files do get installed, but some folders don't get installed (the one I found out didn't install was steamui\skins). When I try to open the settings menu through commands, the task bar shows that a Steam window opens but a second later Steam crashes. I've tried running the installer in Admin Mode and made sure to uninstall the files before attempting a reinstall. I've also tried installing the version prior to the latest and the beta after it, but the same results happened.

[reyaz006]

Can confirm on Windows. Latest Steam Beta.
v3.0.0-beta.19 - does not work
v3.0.0-beta.18 - does not work
v3.0.0-beta.17 - works

[gbzret4d]

v3.0.0-beta.18 works for me on windows but v3.0.0-beta.19 and the latest v3.0.0-beta.20 are not working.

[shdwmtr]

Beta 21 should fix the issue. let me know

[Marocco2]

Beta 21 should fix the issue. let me know

Sorry for late reply, now Millennium is loading correctly.