Cannot plot most terminal currents (transient)

For devices from our foundry's PDK, I cannot plot transistor terminal currents. I can plot at least one type of resistor terminal current.

To make this simpler, I cannot plot terminal currents for the analogLib ideal resistor (res).

Under Outputs->Save All, I have saved all signals, power signals and device currents. The subcircuit probe level is set to 10.

I select the terminal current in the calculator, using the tran tab, and 'it'. This puts the current in the stack:

IT("/R33/PLUS")

When I click Eval, I get this error:

Evaluation error(Unknown scalar data type: nil). Expression: IT("/REE/PLUS")

I'm using Virtuoso ADE 5.10.41.500.6.149

Any help will be greatly appreciated.

Steve