Table tabs greyed out

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Hello,
First post with two questions please. I have an ecommerce (based) website although it does not sell products. It was designed for me. Each record has several tables in them. Now I can't add a new table in a record as the tabs are all greyed out in the record. The only time they become active is when I click inside a table. If I then click outside the table they become greyed out again. And is there a way I can find the most recent records I've updated. I'd like to see if I have invoked something in a reocrd that is causing this. Any ideas please.