Did you try other browsers? Once in a while a PC user gets stuck on one browser when another works.
New PC running W10. I use Chrome.
See link for video of what happens when I click on the "menu" tab of a restaurant. This happens on many sites where I click on a tab that opens a new link. I'm guessing it has something to do with opening a link that has a PDF. Just a guess.
https://www.youtube.com/watch?v=S5vokKcoMiU
I have to X out and then "cancel download."

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