Display window not rendering on my macbook

I am new to Codecademy and I have enjoyed doing the exercises. A problem has occurred on my macbook. The window on the right which displays the rendered content is not there it is just a blank screen. All the other functions are there with the instruction on the left and the code that is being worked on in the middle. When I access on my work PC or on my tablet there is no problem. It did work on my macbook on Tuesday

Can you provide a link to the lesson?

It is happening in all lessons

What web browser are you using? Do you have any extensions installed on those browsers?
Chrome is suggested for the lessons.

Also, take a look at this guide. It might be of some help:

Hi this has now been resolved. I have ran a software update on my MacBook and all is back to normal. Thank you for your comments