MS Excel 2010 Repeat Titles Greyed Out

For some unknown reasons (it wasn't like this earlier) in MS Excel in the Page Layout ribbon, Print Titles, Print Area, Repeat Rows At The Top, are both greyed out and can't understand why and how to overcome to this issue. Any idea?

Nicola SiottoDirectorAsked:
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Isn't workbook shared?
Nicola SiottoDirectorAuthor Commented:
Only in Google Drive.
Saqib Husain, SyedEngineerCommented:
Do you have group mode enabled?

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Nicola SiottoDirectorAuthor Commented:
Just to prove it right, I have created a brand new excel file in by Desktop. Same issue. Therefore I guess it's unrelated on whether it's or not shared.
Nicola SiottoDirectorAuthor Commented:
I have created a new sheet, selected both with the CTRL key pressed. Ungrouped. Now it works. Many thanks.
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Microsoft Excel

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