Hi David,
Based on your description, when you close Excel with maximized window size, next time when opening Excel, the issue happens.
You may try the following steps:
1.Start Excel in safe mode.
Right-click the Start button (lower-left corner) in Windows, and click Run>Alternatively, you can press the Windows logo key and the R key on your keyboard.>in the Run box, type excel /safe , click OK
2.If the issue persists in safe mode, try to perform a clean boot in Windows.
If above doesn't help, please provide the following information for troubleshooting:
1.Does the issue happen to a specific workbook? Create a new workbook, save and close it with maximized window size, reopen it and check if the issue persists.
2.Regarding " the next time i open Excel and try to either "restore down" with the button or grab the menu bar and drag it from being maximized "
Did you reopen Excel by click the Excel icon in the taskbar on the bottom or in the desktop shortcut?
3.For "the inner excel window is separated from an empty excel "shell" with much flashing of my monitor." Please provide related screenshots to describe it.
4.Also, please provide a related screenshot of "It appears that a child window is being extracted from the parent window..."
5.Does the issue happen to a specific computer? Use another computer and check if the issue persists.
Do other people in your company have the same issue?
Regards,
Tina