It seems that media and radiosity don't work well together
with cylindrical light. I think this is because the function
intersect_cylinderlight (in media.cpp) returns the intersections 
not always sorted. 

Applying the following patch, seems to fix the problem in the scene 
reported in a post to povray.advanced-users with same subject:


http://news.povray.org/povray.advanced-users/29502/

Massimo

--- src/media.cpp.ex 2003-01-02 15:31:35.000000000 +0000
+++ src/media.cpp 2003-01-02 15:31:33.000000000 +0000
@@ -2047,8 +2047,8 @@
         }
       }
 
-      *d1 = t1;
-      *d2 = t2;
+      *d1 = min(t1, t2);
+      *d2 = max(t1, t2);
 
       return (true);
     }

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