> I can't open pictures in ImageGlass
There is an issue we are tracking, where if the setting "Loop back viewer to first image" is ON, the first image comes up blank. Using the next/previous image will then show the first image correctly, but ONLY if there is more than one image in the folder. Try setting that option OFF (settings, image tab).
If that is not your issue [i.e. you cannot see any images at all under any circumstances] then I'd make sure you've installed the
.NET Framework 4.8. [But that was a requirement for IG V8.0 too.]
After that, we'll need to try some other things (like deleting your config file, trying other image formats, dragging images into IG instead of double-clicking, etc).