Problems with Zoho Writer Online Word Processor, please help!

I need someone to explain to me why Zoho writer - online word processor keeps telling me that it cannot save my docs. Then when I have written 12-14 pages and try to spell check or look it over to print, it tells me to open it up in PDF file because the words are "hazy", I mean really. This is my third book I have written and never have I had so many problems. While I am writing it will have a pop-up stating "It ( Zoho is having a problem saving my work, I need to stop and try to save it before it get's lost.") What is that about? Please help.