I had a small project to do (a shared document) so I thought it would be an ideal test for Zoho.
I created the document, wrote it, saved it and in an unusually cautious move for me, I copied it into Google Documents as well.
Just as well I did. When I tried to open it again in Zoho I got the error above. The error only occurs for that document, not for documents created before or after it.
I don’t know how commonplace this is with Zoho Writer but I have never had it happen with Google. Looks like I’ll be sticking with Google for a while yet.