I'm having issues with several recently-installed Summits, both 80s, and 800s. I can log in remotely, enter the admin/password and get the full menus. When I put any entry in, (station range for example) and go to load it, it just hangs with the spinning circle of death. I've tried from several different PCs using Chrome and Firefox with the same result.

I can access them through Safari on my iPhone with no problems. Unfortunately, my eyesight isn't good enough to be doing much programming that way.

It's apparent that whatever is causing this has something to do with the settings on my PCs or browsers. Any suggestions?

Try using Edge or latest version of Explorer. Chrome has been acting a bit weird (techy term) lately. I have trouble with it on certain sites, unresponsive and won't take key strokes.