Download error is not important (WRobot loading meshes around current position, it is possible than WRobot try to load an no existing mesh, list of meshes for available for Molten Core is:
MoltenCore_29_33.mesh.gz
MoltenCore_31_34.mesh.gz
MoltenCore_33_31.mesh.gz
MoltenCore_30_32.mesh.gz
MoltenCore_32_29.mesh.gz
MoltenCore_34_30.mesh.gz
MoltenCore_30_33.mesh.gz
MoltenCore_32_30.mesh.gz
MoltenCore_30_34.mesh.gz
MoltenCore_33_29.mesh.gz
MoltenCore_31_33.mesh.gz
MoltenCore_33_30.mesh.gz
Your problem is probably caused by your settings, try to:
In advanced general settings, activate option "Start fighting with Elite"
In advanced general settings tab "Looting and .." increment "Max Units Near"