Safari freezes when using zoho sheet

Safari freezes when using zoho sheet

I have been using zoho sheet for 6 months without a problem.  It has been great!  Thank You!  For the last two weeks, I can't use zoho sheet on my mac.  It opens so a can see my files, and then freezes.  Fortunately, I can still access zoho sheet from my pc.  I have read that this was a problem with the forum, which I discovered when I went to look for a solution.  Any ideas?  What has changed in the last two weeks?
 
Thanks.