Currently Being ModeratedDec 2, 2012 3:54 AM (in response to hansm)
I assume you have your spell check set correctly to your country:
double click the characters in a cell to highlight
right click on them
sellect spelling ....
from the dropdown select your country
My guess is this is one of the strange things M Lion is doing.
Pehaps asking in that discussion group will be more helpfull.