Content field doesn't display in my design wizard?

Hi,

When I try to create a label/header or an html document, the field to enter the content is missing for me for some reason. It works on my colleague’s computer and I haven’t noticed a difference between our setups. I am running Studio 2019.12.0-beta.61 Community. I also tried installing Studio 2019.10.3 Community but selecting Preview Updates in the installation options, looks exactly the same.

Content text below was added by my colleague, but when I open it on my computer I can’t see or edit it.

Any ideas what the problem is or how to fix it?

Thanks.