What happened to the save function in order to save Zoho sheets?

 

Up until the end of last month (April 2013), I have been updating our Zoho sheet .xls file wiithout problem, but now cannot do it. Why is this? I don't want to 'Save As' a document or template, just save it like I could before, so that each time I sign in to Collaboration APP Docs it is there each time. How can I now do this?

 

If this function has been deliberately removed, could I ask why this is?