I've looked around, and can't get to the heart of the issue.
When stepping through the following code, I get the error
Can't execute code in break mode
My workbook does not have any Worksheet_Change events, or any other macros running in the background. I've disabled all possible volatile functions, etc.
Sub replace_OPEN()
Dim lastCol&, endRow&, i&
Dim mainWS As Worksheet
Set mainWS = Sheets("Scoring page")
lastCol = Cells(1, Columns.Count).End(xlToLeft).Column
With mainWS
For i = 1 To lastCol Step 2
    endRow = .Cells(.Rows.Count, i).End(xlUp).Row
    For Each cel In .Range(.Cells(2, i), .Cells(endRow, i))
        cel.Select
        If cel.Value = "[OPEN]" Then ' ERROR POPS UP AT THIS LINE !!!!!!
            cel.Select
            If cel.Offset(1, 0).Value = "" Then
                cel.Value = "[EMPTY]"
                cel.Offset(1, 0).Value = "[FILLED IN]"
                cel.Offset(0, 1).Value = 0
                cel.Offset(1, 1).Value = 3
            End If
        End If
    Next cel
Next i
End With
End Sub
I'm more than aware not to use .Select, but I like to use it while stepping through macros, so I can double check the right things are being worked on, before releasing the entire macro on my sheet.  This thread kind of helped, but again, I don't have any extra code in there, nor do I have any On Error Goto anywhere.
I could, I suppose, send that info to Debug.Print, but I'm curious how to track down the Can't Execute... error.  Could it be something in the Personal.xlsb macros, as I have other things there...
I've even pressed CTRL+PAUSE BREAK a couple times, as that's worked in the past, IIRC. I'm also very aware of this super common issue - I've looked around to troubleshoot, but nothing that's worked for others has worked for this spreadsheet.
Thanks for any ideas.
Edit: Sometimes it throws the error on the very first run of the macro. Then I hit STOP, run again and it stops the first time. ...or vice versa. Can't get it to be consistent.
Edit2: Giving this more thought, It's 80%+ likely it's my Personal.xlsb but I don't have any On ____ Change macros, so wouldn't think it would cause an issue. Hm.
 
    