It's now November 2014, and I've got the same problem in my Excel 2007 application. The right-click context (shortcut) menus (in cells and columns/rows) do not work in any workbook, including a fresh workbook with no content, no macros, no add-ins, nothing. The
menus are only disabled in my account. I can go to use Excel 2007 in another account and the context menus work fine there. I've tried to repair Office using the distribution DVD as an admin - did nothing. The problem seemed to start when I was experimenting
with the RAND Excel function in cells.
This experimenting also caused Excel 2007 to not work at all, displaying an empty worksheet (no cells) and the following error on start-up "There was a problem sending the command to the program." I investigated that and found Microsoft Knowledge Base article
KB211494. I tried that solution (Resolution: Turn off the "Ignore other applications that use Dynamic Data Exchange (DDE)" setting). That cleared up the start-up problem, but the context menus continue to be unavailable. Any advice would be greatly appreciated.
Thanks.