The strangest thing has happened in my excel 2007, running in vista 64. As of yesterday, it no longer displays the individual tabs for worksheets in a workbook of existing files. Any new blank file it will show the standard three tabs. Its not a problem with the file which when viewed in vista 32 or xp still shows the tabs. I've searched the ms knowledgebase and the web, but this appears to be a one of a kind. The "unhide" worksheet feature is greyed out in excel.
Any ideas, suggestions would be welocme