As already mentioned in another thread: I've had this shadow problem one time after installing sr4. I then switched between firefly/p4 renderer. Rendered. Turned shadows off/on/off. Changed "Dist End" settings to some value and back - and suddenly depthmap shadows in firefly worked. And until now there are no more problems. (Tested with a lot of other old scenes and new scenes) So my guess would be, that somewhere burried is a program flag which didn't get set correctly when updating and because of my "switching" I finally "activated" this flag. (From a programmers point of view this isn't so unusual.) But anyway, this is only wild guessing... ;-)