Highlight a lemming so it will show a glider shadow. For some reason, small gray dots randomly appear in the level (circled in the picture below).
This is probably more Nepster's area (since he wrote the code for glider shadows), but if he doesn't get to it first I'll take a look at it sometime in the next few days.
These dots are the glider's path when the skill is assigned. I personally think it's not a bug, but a nice idea. The glider's path shadow also detects updrafts (see picture below)
This bug only occurs in V1.47, but not in the new-formats version namida and I am working on. So unless you think this very annoying, I would accept it as a temporary graphical bug, that will automatically be fixed when we switch to the new level file formats.
Minim: In addition to the glider path, there are two isolated gray pixels, that should not be there.
This bug should be fixed in V1.48.