Commented Issue: Cannot add more than 1 pivot table to xlsx file [14695]

I have attached a mvc3 c# project that creates two tabs of data(6 rows, 6 columns) and then tries to create two pivot table, each on their own tab. If I only create one pivot table(does not matter which one) it works. But when I try to build both pivot tables I get an error message when I open the file in excel "Excel found unreadable content. Do you want to recover. I answer yes and it displays "Removed Records: Workbook properties from /xl/workbook.xml part (Workbook)"........And the 2nd pivot table is always empty.
I purposely made sure that I did not use any duplicate names/fields .

Any suggestions would be appreciated.
Comments: Fixed in changeset 3992e0ed4ed5