Why is the save button on excel not working?

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User offline. Last seen 2 years 47 weeks ago. Offline
Joined: 06/26/2009
Posts: 3

The save button on excel is at the top of the page, but it a see through colour. How can I get it to work again?
Thanks for replies so far. And yes I can save in word and powerpoint. Very odd!
Can't even go into save as