I am unable to generate any kind of visualization but am a new user. I have been trying to access legacy expression datasets relative to skin melanoma: eg. TGCA melanoma, or the Lin 2008 dataset. These are easy to select in the first column, although I see a permanently

turning wheel. Picking a gene of interest, where I'd want to observe expression levels according to the next column's variable, is also easy. But once I choose one of the options (cf image below), and press the Done button, I get only a blank page thereafter.
This occurs both on Edge and on Firefox, and on multiple computers. What am I doing wrong, please?
For that matter, even when following this tutorial to the letter:
Tutorial: Tumor vs Normal | User Help PagesI do not see any samples ever load. I suppose the issue starts here.
Thanks for any assistance. It must be something trivial but I can't find what.