I can't insert chart?!

One of my colleagues is trying to insert a chart into a very normal excel spreadsheet.

When she highlights her data, the boxes grey out. So it is understanding the data is 'there'

but when you go to the 'insert chart type', it is not showing you a preview of each of the charts.

And when you try to create it, it isn't returning anything. When you highlight the data, it says you need to highlight the data.

So it's almost like something is switched off in the background to stop her from doing that. When she emails the excel to me it works fine, any ideas?

She did get a corrupted message one an excel yesterday but has used fresh excel sheets since...