https://sourceforge.net/p/vpopmail/bugs/222/
If vadduser or vadddomain are used on a VPopMail-5.4.33 installation that has been compiled
with --disable-users-big-dir then the .dir-control file in the domain directory is not created/updated.
This leads to problems using vdominfo and vdeluser.
I have written a patch to deal with the issue, but struggled a little with nice function naming in bigdir.c
but needed to get a server fixed quickly.

diff -uPr vpopmail-5.4.33.orig/bigdir.c vpopmail-5.4.33/bigdir.c
--- vpopmail-5.4.33.orig/bigdir.c	2011-02-28 17:00:45.000000000 +0000
+++ vpopmail-5.4.33/bigdir.c	2013-01-15 16:06:16.000000000 +0000
@@ -49,12 +49,25 @@
 
 int dec_dir_control(char *domain, uid_t uid, gid_t gid)
 {
+	return quick_dec_dir_control(domain, uid, gid);
+}
+
+int quick_dec_dir_control(char *domain, uid_t uid, gid_t gid)
+{
 	open_big_dir(domain, uid, gid);
 	--vdir.cur_users;
 	close_big_dir(domain, uid, gid);
 	return(0);
 }
 
+int quick_inc_dir_control(char *domain, uid_t uid, gid_t gid)
+{
+	open_big_dir(domain, uid, gid);
+	++vdir.cur_users;
+	close_big_dir(domain, uid, gid);
+	return(0);
+}
+
 char *next_big_dir(uid_t uid, gid_t gid)
 {
 	inc_dir_control(&vdir);
diff -uPr vpopmail-5.4.33.orig/vauth.h vpopmail-5.4.33/vauth.h
--- vpopmail-5.4.33.orig/vauth.h	2013-01-15 16:03:10.000000000 +0000
+++ vpopmail-5.4.33/vauth.h	2013-01-15 16:06:49.000000000 +0000
@@ -104,6 +104,8 @@
 char next_char(char, int, int);
 int inc_dir_control(vdir_type *);
 int dec_dir_control(char *domain, uid_t uid, gid_t gid);
+int quick_dec_dir_control(char *domain, uid_t uid, gid_t gid);
+int quick_inc_dir_control(char *domain, uid_t uid, gid_t gid);
 void print_control();
 
 int vread_dir_control(vdir_type *vdir, char *domain, uid_t uid, gid_t gid );
diff -uPr vpopmail-5.4.33.orig/vpopmail.c vpopmail-5.4.33/vpopmail.c
--- vpopmail-5.4.33.orig/vpopmail.c	2013-01-15 16:03:10.000000000 +0000
+++ vpopmail-5.4.33/vpopmail.c	2013-01-15 16:14:35.000000000 +0000
@@ -724,7 +724,7 @@
     if (verrori != 0 ) return(verrori);
     else return(VA_BAD_U_DIR);
   }
-        
+
   /* add the user to the auth backend */
   /* NOTE: We really need to update this method to include the quota. */
   if (vauth_adduser(username, domain, password, gecos, user_hash, apop )!=0) {
@@ -1807,7 +1807,11 @@
 
   /* write the information to backfill */
   backfill(user, domain, mypw->pw_dir, 2);
+#ifdef USERS_BIG_DIR
   dec_dir_control(domain, uid, gid);
+#else
+  quick_dec_dir_control(domain, uid, gid);
+#endif
 
   /* remove the user's directory from the file system 
    * and check for error
@@ -2414,6 +2418,8 @@
   } else
 	r_mkdir(user_hash, uid, gid);
   chdir(user_hash);
+#else
+  quick_inc_dir_control(domain, uid, gid);
 #endif
   /* check the length of the dir path to make sure it is not too 
      long to save back to the auth backend */