Hi all, thanks for responding. I did more stuff and it is now working.
bob found
Nov 3, 2021, 15:41 GMT+1
It is now running and I don't think it had anything to do with Java or
Win11 issue.
When I hovered over the icon in my task bar, it would indicate the file
it thought was loaded, one that I created last week. But the popup
little window didn't show the file, only white space and when I clicked
on it, nothing happened, ie the page didn't open. I was curious about
this because I re-installed Arduino about 5 times and yet this file kept
showing up in the header. So I removed that file from the sketch
directory (it was in separate space from the executables which were in
program files) and restarted the app. And it worked. I can't see a
problem with my file (the one that I moved) because I had been editing
it quite a bit. Maybe I saved it with a control character in the
filename...or something. I don't know.
anyhoo...it's working now and I reloaded the file I thought may be in error, with no issues. One thing: I was using an app to keep one file constantly in front of the other. Maybe this put some funny characters inside the file.