Bug #66338 You cannot edit more that 3 tables in ERR diagram, add/edit columns or inserts.

Description:
After creating 3 tables and switching in between their properties it works only 3 ties. I have to reopen.

----- Developer Notes -----

MySQL Workbench CE for Windows version 5.2.41  revision 9727
Configuration Directory: C:\Users\bs\AppData\Roaming\MySQL\Workbench
Data Directory: C:\Program Files (x86)\MySQL\MySQL Workbench 5.2 CE
Cairo Version: 1.8.8
OS: Microsoft Windows 7  (build 7600), 64-bit
CPU: 2x Intel(R) Core(TM)2 CPU          6600  @ 2.40GHz, 3.9 GiB RAM
Active video adapter (0): NVIDIA GeForce GTX 560
Installed video RAM: 1024 MB
Current video mode: 1680 x 1050 x 4294967296 colors
Used bit depth: 32
Driver version: 8.17.12.7533
Installed display drivers: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Active video adapter (1): Intel(R)  G965 Express Chipset Family
Installed video RAM: 384 MB
Current video mode: 1280 x 1024 x 4294967296 colors
Used bit depth: 32
Driver version: 8.15.10.1930
Installed display drivers: igdumd64.dll,igdumdx32
Current user language: English (United States)

Exception = System.InvalidCastException
Message = Unable to cast object of type 'MySQL.Forms.MenuItemImpl' to type 'MySQL.GUI.Workbench.Plugins.DockablePlugin'.
FullText = System.InvalidCastException: Unable to cast object of type 'MySQL.Forms.MenuItemImpl' to type 'MySQL.GUI.Workbench.Plugins.DockablePlugin'.
   at MySQL.GUI.Workbench.Plugins.DockablePlugin.GetFromFixedPtr(IntPtr ptr)
   at MySQL.GUI.Workbench.MainForm.ShowPlugin(IntPtr ptr)
   at MySQL.Forms.AppImpl.show_editor_wrapper(UInt32 native_handle)
   at boost.detail.function.void_function_invoker1<void (__cdecl*)(unsigned int),void,unsigned int>.invoke(function_buffer* function_ptr, UInt32 a0)
   at wb.ModelDiagramForm.handle_mouse_double_click(ModelDiagramForm* , MouseButton , Int32 , Int32 , EventState )
   at MySQL.Workbench.ModelDiagramFormWrapper.OnMouseDoubleClick(MouseEventArgs e, Int32 X, Int32 Y, Keys keystate, MouseButtons buttons)
   at MySQL.GUI.Workbench.ModelDiagramForm.CanvasPanel_MouseDoubleClick(Object sender, MouseEventArgs e)
   at System.Windows.Forms.Control.OnMouseDoubleClick(MouseEventArgs e)
   at MySQL.Utilities.WindowsCanvasViewerPanel.OnMouseDoubleClick(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

How to repeat:
After creating 3 tables and switching in between their properties it works only 3 ties. I have to reopen.

Thank you for the bug report.

Duplicate of bug #66013