Public bug reported:

This fails and renders all the tiles the same, I need to run the program
multiple times to get different tiles.

#!/usr/bin/env python2
from mapnik import *
import sys
for x in range(35,40) :
    mapfile = 'split/style_%d.xml' % x
    map_output = 'maps/layer_%d.png' % x
    m = Map(4*1024,4*1024)
    load_map(m, mapfile)
    bbox=(Envelope( 20.271,42.06,21.804,43.125 ))
    m.zoom_to_box(bbox)
    print "output = " , map_output
    render_to_file(m, map_output,'png256')
    del m

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: python-mapnik 0.7.1-6
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic-pae 3.0.22
Uname: Linux 3.0.0-17-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Sun Apr 15 21:31:15 2012
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=C
 LANGUAGE=C
SourcePackage: mapnik
UpgradeStatus: Upgraded to oneiric on 2011-12-03 (134 days ago)

** Affects: mapnik (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 oneiric

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https://bugs.launchpad.net/bugs/982548

Title:
  When I render two files from osm data, both have the same image

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