Particle edit brush strengths were loaded wrong for old files.

source/blender/blenloader/intern/readfile.c

@@ -10687,6 +10687,15 @@ static void do_versions(FileData *fd, Library *lib, Main *main)
 			SEQ_END
 		}
 
+		/* particle brush strength factor was changed from int to float */
+		for(sce= main->scene.first; sce; sce=sce->id.next) {
+			ParticleEditSettings *pset= &sce->toolsettings->particle;
+			int a;
+
+			for(a=0; a<PE_TOT_BRUSH; a++)
+				pset->brush[a].strength /= 100.0;
+		}
+
 		for(ma = main->mat.first; ma; ma=ma->id.next)
 			if(ma->mode & MA_TRACEBLE)
 				ma->shade_flag |= MA_APPROX_OCCLUSION;