optran is only selected when the 'optran' command has been processed.

If not, the call to the OPtran() function returns the previous
'converged' value.

src/include/ngspice/cktdefs.h

@@ -405,7 +405,7 @@ extern int PZpost(CKTcircuit *);
 extern int PZaskQuest(CKTcircuit *, JOB *, int , IFvalue *);
 extern int PZsetParm(CKTcircuit *, JOB *, int , IFvalue *);
 
-extern int OPtran(CKTcircuit *);
+extern int OPtran(CKTcircuit *, int);
 
 #ifdef WANT_SENSE2
 extern int SENaskQuest(CKTcircuit *, JOB *, int , IFvalue *);

src/spicelib/analysis/cktop.c

@@ -89,7 +89,9 @@ CKTop (CKTcircuit *ckt, long int firstmode, long int continuemode,
             return converged;
     }
 
-    converged = OPtran(ckt);
+    /* If command 'optran' is not given, the function
+       returns immediately with the previous 'converged' */
+    converged = OPtran(ckt, converged);
 
 #ifdef XSPICE
     /* gtri - wbk - add convergence problem reporting flags */

src/spicelib/analysis/optran.c

@@ -220,7 +220,7 @@ int OPsetBreak(CKTcircuit *ckt, double time)
    Thus this algorithm creates an operating point to start other simulations.
    The code is derived from dctran.c by removing all un-needed parts.*/
 int
-OPtran(CKTcircuit *ckt)
+OPtran(CKTcircuit *ckt, int oldconverged)
 {
     int i;
     double olddelta;
@@ -243,10 +243,10 @@ OPtran(CKTcircuit *ckt)
     int redostep;
 #endif
 
-    /* if optran command has not been given (in .spiceinit or in .control section,
+    /* if optran command has not been given (in .spiceinit or in .control section),
        we don' use optran */
     if (nooptran)
-        return 1;
+        return oldconverged;
 /*
     ACAN *acjob = (ACAN *) ckt->CKTcurJob;
     TRANan *trjob = (TRANan *) ckt->CKTcurJob;