Lost all text on whiteboard after updating software from 5.12.9 to 5.13.7

For various reasons! I am still using Mac OS 10.14.6.

I had a workshop yesterday using zoom 5.12.9 and built a whiteboard – see the image with text below.

After I realised I needed to upgrade Zoom. Did that today to 5.13.7

Now this is how my whiteboard looks - see the image with no text below.

Also I can no longer input text to a whiteboard.

Any suggestions?