I have a user who opens a spreadsheet, and it doesn't appear. The title bar has the sheet name. The window menu shows that the sheet is the active one.<br><br>If I open another spreadsheet, it appears. When I maximize the second sheet, the first one appears.<br><br>As long as the sheets are maximized the problem sheet is visible. When it is not maximized, it is nowhere to be found.<br><br>Why would this happen?