diff -Nurp libdvdnav-4.2.0+20130225/src/vm/vm.c libdvdnav-4.2.0+20130225-lp1094499/src/vm/vm.c
--- libdvdnav-4.2.0+20130225/src/vm/vm.c	2013-03-13 10:45:20.000000000 -0700
+++ libdvdnav-4.2.0+20130225-lp1094499/src/vm/vm.c	2013-04-12 16:03:11.492203363 -0700
@@ -1774,12 +1774,15 @@ static int set_VTS_PROG(vm_t *vm, int vt
 }
 
 static int set_FP_PGC(vm_t *vm) {
+  fprintf(MSG_OUT, "lp1094499: set_FP_PGC(vm=%p)\n", vm);
   (vm->state).domain = DVD_DOMAIN_FirstPlay;
   if (!vm->vmgi->first_play_pgc) {
     return set_PGCN(vm, 1);
   }
   (vm->state).pgc = vm->vmgi->first_play_pgc;
   (vm->state).pgcN = vm->vmgi->vmgi_mat->first_play_pgc;
+  fprintf(MSG_OUT, "lp1094499: .pgc=%p\n", (vm->state).pgc);
+  fprintf(MSG_OUT, "lp1094499: .pgcN=%d)\n", (vm->state).pgcN);
   return 1;
 }
 
@@ -1792,10 +1795,14 @@ static int set_MENU(vm_t *vm, int menu)
 static int set_PGCN(vm_t *vm, int pgcN) {
   pgcit_t *pgcit;
 
+  fprintf(MSG_OUT, "lp1094499: set_PGCN(vm=%p, pgcN=%d)\n", vm, pgcN);
+
   pgcit = get_PGCIT(vm);
   if (pgcit == NULL)
     return 0;
 
+  fprintf(MSG_OUT, "lp1094499: pgcit=%p\n", pgcit);
+
   if(pgcN < 1 || pgcN > pgcit->nr_of_pgci_srp) {
 #ifdef TRACE
     fprintf(MSG_OUT, "libdvdnav:  ** No such pgcN = %d\n", pgcN);
@@ -1806,6 +1813,8 @@ static int set_PGCN(vm_t *vm, int pgcN)
   (vm->state).pgc = pgcit->pgci_srp[pgcN - 1].pgc;
   (vm->state).pgcN = pgcN;
   (vm->state).pgN = 1;
+  fprintf(MSG_OUT, "lp1094499: .pgc=%p\n", (vm->state).pgc);
+  fprintf(MSG_OUT, "lp1094499: .pgcN=%d\n", (vm->state).pgcN);
 
   if((vm->state).domain == DVD_DOMAIN_VTSTitle)
     (vm->state).TT_PGCN_REG = pgcN;