I'm having serious problems modelling the infinite resistor grid problem. When creating a PSpice netlist from OrCAD I am being told that I haven't included a ground net. However, I have added plenty of ground symbols (Place->Ground) and have ensured that the net name is "0".
Any ideas about what's going wrong here?
Your design has two simulation profile and both of these are working fine in version 16.3 at my end. Can you name simulation profile where you are facing this problem? Is this "SCHEMATIC1-transient" or "inf-transient"? Also share the .out file when you get this error since we can not see the error at our end with same design.
Having your installation updated to 16.6 is anyway good idea.