When I click elements in the left hand navigation on desktop it is blank. Everything is missing. I am at a standstill in my design work without these items. None of the topics are relevant to this issue.
That usually works for me, a complete refresh, but if it doesn't:
Testing another recommended browser e.g Edge, Firefox or Safari.
Testing with an incognito window.
Doing all the boring testing stuff helps when it comes to reporting the problem here. If the problem still persists please come back with information about your operating system and the browser you are using, or have tested, and someone can investigate further.