I appreciate everyone's replies, but this was the original problem. Placed a unit behind a low stone wall, and had clear LOS for mucho meters. Issued a Hide order. LOS didn't extend beyond their noses. Clicked Hide again...no change. Tried to fire the unit at an area target, thinking they would "unhide." No change. Moved the unit, no change. Clicked Hide again, hoping it would "toggle." No change, and still about a 1 meter LOS. All this while the five-member gun screw showed Hiding, spotting, spotting, hiding, spotting. Still lost all that good LOS. The color of the Hide button never changed, and the gun basically became useless.
Could really use a "stop hiding" button in this game, but then again, the entire "terrain" chapter was omitted. Saw threads referencing "fords." Evidently, tanks can no longer cross at fords. Seems rather odd to me. I also miss the feature that told you what type of terrain the unit occupied, and "scattered trees" seem to have disappeared from the game. Not to mention the LOS tool that told you if you were attempting to move up a "slope" or other impassable terrain with a vehicle.
For all the great graphics and the "smart" soldiers that seek defilade terrain while moving, TOO MUCh has been omitted from the cmx1 system, let alone the rule book.