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Thank you for the replies, Johannes_B and Stefan Kottwitz. I didn't succeed in following either of your suggestions, but on a whim I tried starting TexWorks from MikTeX Console, and it worked! Maybe that's what I'd done before. So there's no problem right now.

If you're curious, Stefan, I chose ...

Hello. I recently installed TexWorks and MikTeX on my Mac Mini (MacOS Mojave 10.14). I got a document to work perfectly (a test for my students). I started another document and when I tried to typeset it, I got the error message "pdfLaTex not properly configured". When I go to the drop-down menu ...

Hello. I'm a physics teacher and long-time TeX user (but not expert) hoping for help with problems that come up now that I suddenly have to work from home.