De-render not working

Hi,

I am using the google docs add on an rendered a block and kept working on my document. I wanted to come back to this block at a later time by de-rendering and copying some part of an equation out of it. However, now I am getting an error message saying

Error :

Plese select LaTeX renderd image to De-Render

Is that a known bug? And is it therefore recommended to keep everything as latex code until I want to publish the doc?

You need to click on the rendered image before trying to derender. Did you do that?