joomla 2.5 spreadsheet can't edit or save

I have installed the plugin an created the artilce "
You can insert any text before
or after spreadsheet instance
but I don’t get any of the edit icons deisplaying, I am logged in as super user.

Any ideas what to check?

I am able to edit the article from the front end.

try to use attached package, please.
By the way, make sure that you’re logged in at front-end. (1.8 MB)