Problem description: 
Table position is lost when re-opening a file.

Steps to reproduce:
1. Create a new Text document
2. From the Table menu Insert | Table
3. In the Insert Table dialog, Click OK
4. Select the first cell in the table
5. From the Table menu select Table Properties
6. In the Table Format dialog select "From Left" under Alignment
7. Change the Width to 6"
8. Change the Left spacing to 0.50"
9. Click the OK button
10. From the File menu select Save As
11. Save as type MS Word 2007/2010 XML (.docx)
12. Close the document
13. Reopen the document
14. Select the first cell in the table
15. From the Table menu select Table Properties

Current behavior:
The Left spacing has changed to 0.43"

Expected behavior:
The Left spacing should stay at 0.50" as originally specified.

Platform (if different from the browser): 
              
Browser: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1