Hello, just discovered that game today and so far its best find of the year (huh ... figures).
However, altough its my first game, I encountered the bug described on this topic, in the map displayed on the screenshots.
I've moved my soldiers everywhere in the map ("not behind that fridge either ? damn. Wait, maybe he's disguised as this fat civilian ? *BANG* ... hm, seems not.").
Im not sure of the version number, its the stable release that's currently available for download from the main page.
I really cant say for sure, but I would say the problem could be located near the "blue zone" pointed by ZebTa. Im pretty sure I saw an enemy arround here at some point while moving, did not shot it, and never saw it again. Since my game's still running, ill try to put my soldiers arround here and see if one falls.