Version:           2.0.1.1 (using KDE 4.2.0)
Compiler:          gcc 4.3.3 
OS:                Linux
Installed from:    Gentoo Packages

On proportional biased dynamic playlist "Last played" match is saved as "listplay", not as "lastplay" to ~/.kde4/share/apps/amarok/dynamic.xml. So the playlist is not working when amarok reads the file.

It seems to be a typo in XmlQueryWriter.cpp, here's the fix:

--- src/collection/support/XmlQueryWriter.cpp.orig      2009-02-07 14:22:52.000000000+0200
+++ src/collection/support/XmlQueryWriter.cpp   2009-02-07 14:23:58.000000000 +0200
@@ -446,7 +446,7 @@
         case Meta::valScore:       return "score";
         case Meta::valRating:      return "rating";
         case Meta::valFirstPlayed: return "firstplay";
-        case Meta::valLastPlayed:  return "listplay";
+        case Meta::valLastPlayed:  return "lastplay";
         case Meta::valPlaycount:   return "playcount";
         default:                   return "";
     }