Excel Workbook Open Event macro doesn't always run

Question

I\'ve got a Workbook_Open event macro (and it\'s in ThisWorkbook) that doesn\'t always run.

• If Excel is closed and I double-click the .xls file from Windows Ex

Answer 1

To add to the Arturo Llano post: The following code was used to monitor the Workbook_Open event and then run ProcessX whenever a workbook was opened.

ProcessX contained an End statement. The result was that it worked only the first time. The End wiped out AppX, so there was no further monitoring of events. Removing End fixed the problem. (Using End is bad practice anyway as it stops everything without any kind of cleanup or termination of other resources).

'Code in: Personal.xlsb ThisWorkbook

Public WithEvents AppX As Application

Private Sub Workbook_Open()

   Set AppX = Application

End Sub

Private Sub AppX_WorkbookOpen(ByVal wb As Workbook)

  'A 1-second delay to allow opening to complete before ProcessX starts.

   Application.OnTime Now + TimeValue("00:00:01"), "ProcessX"

End Sub

Answer 2

I was experiencing almost identical behavior, and found that it is due to a bug that occurs if conditional formatting rules are erroring out. It turns out that if the conditional formatting rules are based on any setup by the macros, and that causes the conditional formatting to error, the Workbook_Open macro will not even attempt to run.

To test, make a copy of your file, and delete all conditional formatting from the workbook. Save and reopen. If it fixes your issue, then rework the conditional formatting rules to not depend on functions/values that will be broken before the Workbook_Open macro runs.

Answer 3

What causes it is that your other archive, the one you openned first, have a Workbook_Open procedure; Excel doesn't excute it a second time.

Answer 4

I thought that this was the most cogent article on this problem (which is a long-standing never explained completely erratic bug that Excel exhibits). (dead link)

In short, in many cases it's a timing thing caused because the workbook is trying to calculate stuff when it opens and that gets in the way of the Workbook_Open event. The way to test on yours to see if that it for this situation, is to first rename any UDFs or Macros called by cells so that they won't get called and see if that changes anything.