lighting causing segfault only with textured level

Hi there,

Up until now I have just had ambient lighting for my map.

I tried doing:
csRef<iLight> light = engine->CreateLight("DynLight", csVector3(-19, 120, 34), 300, csColor(1, 1, 1));
if(!light)
{
app->ReportError("Failed to create light!");
}
levelsector->GetLights()->Add(light);

This works fine on an untextured map (where textures get replaced with the checkerboard) , but causes a segfault when I use the textured map.

It is the

levelsector->GetLights()->Add(light);

line that causes the segfault. Valgrind debugger gives me the following:

==28337== Process terminating with default action of signal 11 (SIGSEGV)
==28337== Access not within mapped region at address 0x0
==28337== at 0x260C0E1B: CastShadows_Front2Back(csKDTree*, void*, unsigned, unsigned&) (in /home/kate/csinstall/lib/crystalspace/frustvis.so)
==28337== by 0x158E90EE: csKDTree::Front2Back(csVector3 const&, bool (*)(csKDTree*, void*, unsigned, unsigned&), void*, unsigned, unsigned) (in /home/kate/csinstall/lib/crystalspace/engine.so)
==28337== by 0x158E9175: csKDTree::Front2Back(csVector3 const&, bool (*)(csKDTree*, void*, unsigned, unsigned&), void*, unsigned, unsigned) (in /home/kate/csinstall/lib/crystalspace/engine.so)
==28337== by 0x158E9125: csKDTree::Front2Back(csVector3 const&, bool (*)(csKDTree*, void*, unsigned, unsigned&), void*, unsigned, unsigned) (in /home/kate/csinstall/lib/crystalspace/engine.so)
==28337== by 0x158E9125: csKDTree::Front2Back(csVector3 const&, bool (*)(csKDTree*, void*, unsigned, unsigned&), void*, unsigned, unsigned) (in /home/kate/csinstall/lib/crystalspace/engine.so)
==28337== by 0x158E9125: csKDTree::Front2Back(csVector3 const&, bool (*)(csKDTree*, void*, unsigned, unsigned&), void*, unsigned, unsigned) (in /home/kate/csinstall/lib/crystalspace/engine.so)
==28337== by 0x158E9125: csKDTree::Front2Back(csVector3 const&, bool (*)(csKDTree*, void*, unsigned, unsigned&), void*, unsigned, unsigned) (in /home/kate/csinstall/lib/crystalspace/engine.so)
==28337== by 0x158E9125: csKDTree::Front2Back(csVector3 const&, bool (*)(csKDTree*, void*, unsigned, unsigned&), void*, unsigned, unsigned) (in /home/kate/csinstall/lib/crystalspace/engine.so)
==28337== by 0x260C570A: csFrustumVis::CastShadows(iFrustumView*) (in /home/kate/csinstall/lib/crystalspace/frustvis.so)
==28337== by 0x158ACEB3: csSector::RealCheckFrustum(iFrustumView*) (in /home/kate/csinstall/lib/crystalspace/engine.so)
==28337== by 0x1584FBCD: csLight::CalculateLighting() (in /home/kate/csinstall/lib/crystalspace/engine.so)
==28337== by 0x158391B9: csEngine::ShineLights(iRegion*, iProgressMeter*) (in /home/kate/csinstall/lib/crystalspace/engine.so)

It looks like a null pointer problem at : CastShadows_Front2Back(csKDTree*, void*, unsigned, unsigned&) (in /home/kate/csinstall/lib/crystalspace/frustvis.so)

any ideas what is causing this. Im assuming it is something to do with the textures but what? Could missing/wrongly applied textures cause the problem?

regards,

Kate Mallichan