Ran into an interesting issue. When I try to open jpg files, Gwenview will try to open, then immediately close. I can open the images if I start Gwenview first and navigate to the directory.
I did confirm it was the default for jpg files
I also tried right-clicking on the file and opening it that way, but I get the same result. Wondering if anyone else is seeing this or has seen this behavior.
Edit: Now to add to the mystery. I got up and came back and now it works. All I did was leave Gwenview running for a few moments.