Thank you for your reply.
Yes, I was hoping to find a scrollbar at the bottom, That was the major issue. There was no way to scroll to the right, nor was there any indicators that you COULD scroll to the right.
When you mentioned that the hostname was too long, I saw that the description for my desktop "Michael Kammer Desktop I9" wrapped properly,
The item that caused the problem: GS108TMichael, used the same hostname / Description AND client ID
Note: I had a SECOND Netgear GS108T switch (all three elements were "GS108TTheatre", previously configured in the list and the Actions column still remained. The problem occurred when I added another identical Router with a sequential IP.
Note: the MACS were not even close to each other, so that could not be the issue.
so it could not have been the problem as every element in all three fields was 14 characters or less.
In any case, when I remove the last item, everything started working normally