spell check in excel 2007
 

I have merged cells in excel 2007 and when I go to spell check it does not
locate typos. Does anyone know what I might be doing wrong?
I type my text, merge, and then run spell check. Also I have deliberately
made typos in unmerged text just to see if the spell check would work but it
does not?
Maybe I have a bug?

Any comments greatly appreciated.