Hi,
Some customers solved this issue by the following steps, you may want to have a try:
1. Go to FILE > Options > Proofing > Custom Dictionaries.
2. You will see your language in the list with a checked box next to it.
3. Remove the check and check it again. Then click OK and OK. And hopefully your problem will be solved.
If above wouldn’t work, please try to run a repair of your Office installation and check the result. Please refer:
http://office.microsoft.com/en-us/excel-help/repair-or-remove-office-2010-HA010357402.aspx
Hope this helps.
Thanks.
Steve Fan
TechNet Community Support
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