Thanks for all the answers, Sol.
The editing problem has occurred using not only my normal browser (Pale Moon, a derivative of Firefox) but the latest incarnation of Firefox. Not all the time, but enough to me annoying, I still get gaps and stuck keys. By 'gaps' I mean I hit a key, but nothing gets entered no matter how hard I hit the key. As for repeats, I can barely tough the key and I get several repeats. This problem appears to happen after I highlight a phrase and then use the mouse to drag the highlight to a new spot and then release the mouse. Following that action, I get the kayboard failures.
I am not signed up for the class, but I've received two emails for it - both gave me 'Not Authorized'. These could have been random glitches as I imagine there have been quite a few more than just two notifications sent out.
The mass-delete failures occur in the above mentioned browsers all the time, not just occasionally. I've done some testing and found that I can check 6 boxes and all 6 will be deleted at the same time. If I check 7 boxes or more, including the 'delete everything on the page' box at the top, then none get deleted.
~Tom