OS: Windows 10 Pro #1903 64bit
If I open an image within XnView MP with (for example) paint.NET, change and save the file, XnView MP won't refresh the image and still show the old version. Trying to print it now will print the old version.
Effect: Can be annoying.

To reproduce:
1. Open an image in (for example) paint.NET within XnView MP with the "Open with" command
2. Change the file with whatever program you just opened (for example: invert colors) and save it
3. Close whatever program you just used.
4. XnView MP will still show the unaltered version.
5. Attempting to print it now will print the unaltered version
6. Going to the next file in the viewer or the browser and going back to the file now shows the altered version.
Actual behaviour (bug):

XnView MP does not recognizes changes in the image that is currently shown.
Expected behaviour:
XnView MP recognizes changes in the image that is currently shown.