A) it’s jran, not jrun – the typo may have been the problem?
12 may be out of range for jran – try numbers in the millions
C) I’ve used constant_seed and jran with loop modeling before, I think it should work.
D) If you use constant_seed alone, does it report the RNG seed as 1111111111 (plus or minus a few 1s)? That’s the “constant_seed” if you don’t also use jran.