Seamless Mode not working correctly - no windows

[zuber]

I use VirtualBox 7.1.4 on windows 10 host and Ubuntu 24 guest.

When I switch to seamless mode - all windows disappear.

It was workign correctly on VirtualBox 7.0.20.

Log:

64:52:57.494020 GUI: UIMultiScreenLayout::update: GUI/AutomountGuestScreens is disabled
64:52:57.506379 DnD: User Interface Privilege Isolation (UIPI) is running with SECURITY_MANDATORY_MEDIUM_RID
64:52:57.507570 GUI: UIMachineWindowSeamless::placeOnScreen: Resize window: 0 to: 1920x1040
64:52:57.507608 GUI: UIMachineWindowSeamless::placeOnScreen: Move window: 0 to: 0x0
64:52:57.516431 GUI: UIMachineViewSeamless::adjustGuestScreenSize: Desired hint 1920x1040 for guest-screen #0 differs from the one in IDisplay, adjustment is required.
64:52:57.516478 GUI: UIMachineView::sltPerformGuestResize: Omitting to send size-hint 1920x1040 to guest-screen 0 because frame-buffer is already of the same size.
64:52:57.544699 GUI: Show mini-toolbar for window #0
64:52:57.546528 GUI: Adjust mini-toolbar for window #0
64:52:57.546550 GUI:  Resize mini-toolbar for window #0 to 1920x1040
64:52:57.546557 GUI:  Move mini-toolbar for window #0 to 0x0
64:52:57.557391 GUI: UIMediumEnumerator: Medium-enumeration finished!

[zuber]

I uninstalled old extension pack and it seemed to help

[viedzmin]

Same here. Guest openSUSE Leap 15.5 on Windows 10 host.

[Twisted Lucidity]

Glad to know it's not just me. Failing on:

• ArchLinux (fully updated as of 30 mins ago) using virtualbox-guest-utils 7.1.4 from the AUR
• KDE Neon 6.2 and guest utils from ISO.

In both cases the old vbox guest utils was purged and they are using X11.

Log from ArchLinux when switching to Seamless and all windows vanishing:

00:16:46.167527 GUI: UIMultiScreenLayout::update: GUI/AutomountGuestScreens is disabled
00:16:46.192769 DnD: User Interface Privilege Isolation (UIPI) is running with SECURITY_MANDATORY_MEDIUM_RID
00:16:46.194516 GUI: UIMachineWindowSeamless::placeOnScreen: Resize window: 0 to: 1536x912
00:16:46.194537 GUI: UIMachineWindowSeamless::placeOnScreen: Move window: 0 to: 0x0
00:16:46.200172 GUI: UIMachineViewSeamless::adjustGuestScreenSize: Desired hint 1920x1140 for guest-screen #0 differs from the one in IDisplay, adjustment is required.
00:16:46.200197 GUI: UIMachineView::sltPerformGuestResize: Sending guest size-hint to screen 0 as 1920x1140
00:16:46.200208 VMMDev: SetVideoModeHint: Got a video mode hint (1920x1140x32)@(0x0),(1;0) at 0
00:16:46.224638 Display::i_handleDisplayResize: uScreenId=0 pvVRAM=0000000000000000 w=1920 h=1057 bpp=0 cbLine=0x0 flags=0x2 origin=0,0
00:16:46.227294 Display::i_handleDisplayResize: uScreenId=0 pvVRAM=0000019cf7622040 w=1920 h=1140 bpp=32 cbLine=0x1E00 flags=0x1 origin=0,0
00:16:46.256840 GUI: Show mini-toolbar for window #0
00:16:46.261503 GUI: Adjust mini-toolbar for window #0
00:16:46.261543 GUI:  Resize mini-toolbar for window #0 to 1536x912
00:16:46.261549 GUI:  Move mini-toolbar for window #0 to 0x0
00:16:46.268297 GUI: UIMachineLogicSeamless: Guest-screen count changed.
00:16:46.268612 GUI: UIMultiScreenLayout::update: GUI/AutomountGuestScreens is disabled
00:16:46.268737 GUI: UIMachineLogic: Guest-screen count changed
00:16:46.268754 GUI: UIMachineWindowSeamless::placeOnScreen: Resize window: 0 to: 1536x912
00:16:46.268767 GUI: UIMachineWindowSeamless::placeOnScreen: Move window: 0 to: 0x0
00:16:46.268785 GUI: UIMachineViewSeamless::adjustGuestScreenSize: Desired hint 1920x1140 for guest-screen #0 is already in IDisplay, adjustment is not required.
00:16:46.275805 GUI: UIMediumEnumerator: Medium-enumeration finished!

Host: Windows 11

[Twisted Lucidity]

Is this related to #22239?