Brian, sorry for the delay in replying. I had just been working on the three newsletters I send out each week with lots of links that really need the preview images in them when I first posted this problem. It took a couple of days to find new links to test with.
Today I had enough to do another test. But even though I had to once again delete all the cookies yesterday to get the flashing text cursor to show up I had to delete them again today as well. This is so annoying.
The first time it happened a few weeks ago it affected both my default browser Firefox and Chrome that I only use to test if a problem is caused by Firefox or the OS itself. Strangely deleting the cookies in Firefox seemed to fix the issue in Chrome as well.
In order to be able to get the website preview images to show up when outlook.live.com wouldn't put them onscreen I tried to use CTRL/V instead of only using the mouse. Sometimes they told me that was the only way to be able to do it by putting up a box with instructions to use keyboard not mouse. Sometimes it worked sometimes I had to close the draft and then reopen it to get that to work.
live.com has 13.9MB cookie storage, that seems excessive after only using it for half an hour.