Sort & Filter grayed out

[ljCharlie]

I have a table with A-G columns and 20 rows. If I do not select column A then the "Sort & Filter" is enable. The "Format as Table" also works. As soon as I select column "A" with the rest of the columns then these two functions don't work anymore. It's disabled or grayed out. Any suggestion? I'm using Excel 2010.

[Martin L]

is there any lock on the work sheet?