joomla 2.5 spreadsheet can't edit or save

I have installed the plugin an created the artilce "
You can insert any text before
[[spreadsheet?&width=600px&height=250px&id=5&math=true]]
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.

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