title: PHPExcel Warning/Error when opening document
body: <p>I have built an Excel document using the PHPExcel Library. My document opens and looks fine both in Numbers (mac) and Office 2007 (windows). I am saving my file as a .xlsx file.</p>
  
  <p>When I open the file, although it displays properly, it gives the following errors/warnings.</p>
  
  <p>In Numbers, it gives the warning "<strong>Password protection on sheets isn't supported and was removed</strong>"</p>
  
  <p>In Office 2007 it gives te error "<strong>Excel found unreadable content in 'filename.xlsx'. Do you want to recover the contents of this workbook? If you trust the source of this workbook, click Yes.</strong>" When I click yes, everything displays fine, and it says "<strong>Removed Records: Merge cells from /sl/worksheets/sheet1.xml part</strong>".</p>
  
  <p>It should be noted that I did not add any password to my file. I also have only one workbook. Anyone know how I can get rid of these or what might be causing them?</p>