Decades-long fan of IrfanView here. Today for some reason pressing the Spacebar doesn't advance to the next image; instead it displays the End of Folder dialog, even when I'm obviously not at the end of the folder list. Also, the End of Folder dialog is 'inert' -- I can't select any of the folders listed, and the dialog claims all of them (including the current folder) have zero pictures. (They all show '?' until clicked, then zero.)

Same behavior with Backspace.

I don't see any settings that might've gotten messed up to cause this. Any ideas?

Windows 10 Pro, IrfanView 4.42 (just upgraded hoping it might fix this, no luck).

Thanks for any clues.
Mark