Received a "Microsoft .NET Framework" Error Today

[LogicalSpock2]

MT continued running normally. Windows 10

"Unhandled exception has occurred in your application. If you click continue, the application will ignore this error and attempt to continue. Parameter is not valid."

Details:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.ArgumentException: Parameter is not valid.
   at System.Drawing.Graphics.Restore(GraphicsState gstate)
   at System.Windows.Forms.Control.WmPaint(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9232.0 built by: NET481REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
MT
    Assembly Version: 1.0.0.0
    Win32 Version: 1.1.9932.205
    CodeBase: file:///C:/Program%20Files/Medved%20Trader/MT.exe