I have an addin that saves itself in either the BeforeClose of
AddinUninstall events. If for some reason I open multiple Excel instances,
when I close the one of the later instances the line ThisWorkbook.Save saves
the addin to the active Excel directory, e.g., My Docs. No error is
generated, it just saves a copy to the wrong place.

It's not a big problem if the addins in the multiple instances are not
saved. So instead of ThisWorkbook.Save I wrote code that uses
ThisWorkbook.Saveas and surrounded it with On Error statements and turned of
DisplayAlerts:

If Not ThisWorkbook.Saved Then
'in case it's read-only, which would be true if this were the 2nd (or
more) instance of Excel
On Error Resume Next
Application.DisplayAlerts = False
'I did SaveAs, because if it's read only Save will save to the active
Excel Directory
ThisWorkbook.SaveAs Filename:=ThisWorkbook.FullName
Application.DisplayAlerts = True
On Error GoTo 0
End If
Exit Sub
ErrorHandler:
Application.ScreenUpdating = True
Application.DisplayAlerts = True

This solution falls under the category of "crude but effective, I hope."
Does anybody have a better one?

XL03 Win Vista and XP

Thanks,

Doug