issues with Zoho Writer when working offline via https://docs.zoho.com/writer/offline

issues with Zoho Writer when working offline via https://docs.zoho.com/writer/offline

Hi,

Just signed up to Zoho Docs so I can work across multiple places with different computers, online and offline. My first choice was Google Docs, but the Drive for Mac was just too buggy, I couldn't even get to the sign-in page. 
So I've installed the Zoho Docs for Mac, and I've got it up and working (got a folder and menu-controlled app much like Dropbox), been shuffling some files around and they all get synced - great.
However the main functionality I'm looking for, which is offline editing, is still eluding me. Following the instructions, I set up a Zoho Writer file for offline use, and now when I go offline and enter the  https://docs.zoho.com/writer/offline or click on the file in my desktop folder, it opens it up in offline mode (red box at top saying this). However, the display is buggy (first page only unless I go to preview mode and back), plus it seems to be read-only. Any suggestions? I'm on MacOS 10.8.5, using Chrome v.48 as a browser.

Many thanks!