Workbook hiding itself when it is opened!
 

I have an Excel 2003 (.xls) spreadsheet which when it is open hides itself! To find it you have to go into the "View" menu item and then "Unhide" the workbook. The spreadsheet has a bit of VBA code in it and I have recently added a Workbook_Open() function which does "Application.Visible = True" to tryand rectify the problem but that doesn't seem to help!

Any clues?