The following code no longer works for 11 of my 12 worksheets:

Sub Testing()
Sheets(1).Range("A50").Select
End Sub

If I record a new macro and select any cell in any sheet, the above code is
created. (With appropriate sheets and cell names.) The code works as long
as it stays in the Module it was created in. If I copy and paste the code
into a worksheet, it gives the error: "Run-time error '1004':
Application-defined or object-defined error".

For some reason, If I reference sheet 2 in the above code, the code can be
placed in any worksheet and it will work. That isn't true for any other
sheet however.
Any ideas? Thanks.