There are two connections at each node. There are no loops of inductors or voltage sources. There are no series capacitors or current sources. Dependent source gains are correct. Model parameters are realistic, especially if you copied the model into the netlist by hand.
All resistors have a value.
This is an undocumented option in Spice 2 programs. Check the node-voltage table in the output file. Add resistors and use OFF keyword. Add resistors across diodes to simulate leakage. The OFF keyword tells IsSpice to first solve the operating point with the device off.