I’m using Steam version 1.2.19
when I try to shift an area of the image with the Edit> Shift menu, some portions with one (random) color are deleted.
After that it is not possible to refill that portion. After closing without saving and reopening I can work on the image again.
NOTE: The problem does not occur 100% of the time, but mainly in a file with indexed colors where another palette was loaded (Remap button).