Even Handler Causes Run-time Error 5

Apr 5, 2013

I have a userform that reads data from a sheet with thousands of records (lines) each record with some 30 cells (columns). I wanted the user to scroll up & down in the sheet, using the keyboard arrows and I wanted the userform to show the relevant record, where the cursor stands. For this purpose I created an event handler (Worksheet_SelectionChange) that identifies the scrolling, populates the form with the relevant record data and then returns the focus back to the sheet. The command I have used to send focus back to the sheet (so the user can keep scrolling) is:

VB:
AppActivate "Microsoft Excel" & " - " & ThisWorkbook.Name

Now comes the bizarre part... This macro can work perfectly for hours and then decide to "die", or can work on one computer but not the other (all with Excel 2007, BTW). When the macro dies (or if it does not work, to begin with), the debugger points to the command I mentioned, with an error message "Run-time error '5' , Invalid procedure all or argument."

how to make my macro "stable" (make it work always and on every computer)?

Unfortunately, I cannot upload the file, because it contains confidential data (and it is not in English...).

VB:
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
lr = Cells(Rows.Count, 1).End(xlUp).Row
If Target.Column < 2 And Target.Row > 1 And Target.Row <= lr Then
crow = ActiveCell.Row

[Code]....

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