TSE not loading TGE files??

I wish to try out some shader ideas on the simple level i have started designing in TGE - at this stage it is basic, i.e terrain, waterblock - a few objects etc. When i copy the Main cs file from the starter fps and all necessary game files over to TSE - when i try to run it - i get the message 'open gl is not implemented yet'.

Also i did get it working once, but then when the mission was just about to start it crashed - is this because of the terrains - as the messages in console were related to textures?

Thanks

Steve