Arithmetic operation overflow on mouse scroll?

vvvv gamma bug
1

Hey, I’ve stumbled upon a weird behaviour in 7.0. From time to time, I get the following message in the log:

2025/12/04 21:06:38.512 [CRT] (Sys) 0 vvvv OverflowException: "Arithmetic operation resulted in an overflow."
    StackTrace:
        VL.UI.Forms.MainForm { protected virtual void WndProc(System.Windows.Forms.Message& m) { ... } }
        System.Windows.Forms.NativeWindow { private Windows.Win32.Foundation.LRESULT Callback(Windows.Win32.Foundation.HWND hWnd, Windows.Win32.MessageId msg, Windows.Win32.Foundation.WPARAM wparam, Windows.Win32.Foundation.LPARAM lparam) { ... } }

System.OverflowException: Arithmetic operation resulted in an overflow.
   at VL.UI.Forms.MainForm.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(HWND hWnd, MessageId msg, WPARAM wparam, LPARAM lparam)

The thing is, I get this message even with only one empty patch open. It’s tricky to reproduce, but I’ve found a very specific way to trigger it:

  • Make the vvvv window fullscreen and not active. (I have two monitors, and clicking outside vvvv on the second one accidentally led me to this discovery.)

  • Hover the mouse over the vvvv window and scroll using the secondary (horizontal) scroll wheel. (I’m using a Logitech MX Master, for example.)

This sometimes causes the Log window to pop up with this error. Sometimes it doesn’t, but if the Log window is open, new errors keep appearing when I scroll the mouse.