🐛 Crashes on startup after Windows update

[dawsonbooth]

I have searched through the issues and didn't find my problem.

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Bug description

Nucleus Co-op v2.4.1 crashed on startup after Windows update.

Crashlog:
System.ComponentModel.Win32Exception: Error creating window handle
at System.Windows.Forms.NativeWindow.CreateHandle
at System.Windows.Forms.Form.CenterToScreen
at Nucleus.Coop.ProfileSettings..ctor()

WinDbg/SOS:
System.ComponentModel.Win32Exception nativeErrorCode = 1158
1158 = ERROR_NO_MORE_USER_HANDLES

Workaround:
Set HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\USERProcessHandleQuota to 18000 and rebooted.
Nucleus opened afterward.

Debug Log

[6/6/2026 12:33:00 PM] System.ComponentModel.Win32Exception (0x80004005): Error creating window handle.
   at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp)
   at System.Windows.Forms.Control.CreateHandle()
   at System.Windows.Forms.Form.CreateHandle()
   at System.Windows.Forms.Control.get_Handle()
   at System.Windows.Forms.Form.CenterToScreen()
   at Nucleus.Coop.ProfileSettings..ctor()
   at Nucleus.Coop.MainForm..ctor(String[] args)
   at Nucleus.Coop.Program.RunApplication(String[] args)
   at Nucleus.Coop.Program.Main(String[] args)

Possible fixes or solutions

This likely means Nucleus’s ProfileSettings window is creating an unusually large number of USER/window handles. Raising the quota gives it more headroom, but the app may still be close to a bad design threshold.

Some ideas: lazy-load the profile settings form, reduce HWND-backed controls, or avoid creating that huge settings UI during startup.

Additional information

No response