[Bug]: Lanching the manager from Mate breaks SSVNC X11 session

[riksoft]

Version

7.1.6

Host OS Type

macOS

Host OS name + version

Debian Trixie

Host Architecture

x86

Guest OS Type

all

Guest Architecture

x86

Guest OS name + version

Doesn't matter

Component

VBoxManage CLI

What happened?

Launching Oracle VirtualBox Manager from the MATE menu on Debian 13 breaks SSVNC X11 sessions due to startup notification environment variables. Clearing DESKTOP_STARTUP_ID before starting VirtualBox prevents the X11 event corruption.

(The VirtualBox package is the one from the Oracle website).

How can we reproduce this?

1. Start an X11 desktop session (MATE).
2. Connect to the desktop with SSVNC.
3. Launch Oracle VirtualBox Manager from the MATE menu.
4. SSVNC disconnects immediately.
5. Launching "VirtualBox" from a terminal does not reproduce.
6. Wrapper:
   unset DESKTOP_STARTUP_ID
   exec VirtualBox
   prevents the issue.

In point 4, inside the SSVNC console you can read the error:

CleanupXrErrorHandler
called 2026/07/23 10:11:14 VNC Viewer exiting.
Error: Event with wrong window

Did you upload all of your necessary log files, screenshots, etc.?

• Yes, I've uploaded all pertinent files to this issue.