Starting from mission 7 (Nod) and mission 5 (GDI) if I remember correctly, the game crashes as soon as any player-controlled unit goes near the upper left corner of the map. There are variations, and the extent of the bug is variable (I, for instance, had the crash occur anywhere in the upper quarter of the map). Considering that in some missions you actually start around those areas, and in some others you actually have to go over there, this bug effectively renders Tiberian Dawn unplayable.
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Okay. That's an awful weird bug.
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This is soooo EA "