Problems with loading up the full content of the screen, whether you see a spinner or not, are most commonly caused by corrupt data in your browser's cache. Please try the following steps:
1) Clear your browser's cache and cookies "for all time" (see https://refreshyourcache.com for instructions). You do not need to clear saved passwords or history.
2) If that doesn't fix the problem, try a completely different browser. Chrome and Firefox are the best choices. Do not use Internet Explorer. (This doesn't have to be a permanent switch, but it will help us to know if your original browser is the cause of trouble.)
If the issue does not clear up, please use the "Help" button at the lower left of the screen to contact us. We will need a screenshot of the entire page where you are stuck, including the browser frame.