diff --git a/libbalsa/mailbox.c b/libbalsa/mailbox.c
index d8cd283f3..b9f315be8 100644
--- a/libbalsa/mailbox.c
+++ b/libbalsa/mailbox.c
@@ -2344,6 +2344,7 @@ lbm_sort_idle_cb(LibBalsaMailbox * mailbox)
 
     if (!priv->messages_threaded) {
         libbalsa_unlock_mailbox(mailbox);
+g_print("%s reschedules idle\n", __func__);
         return G_SOURCE_CONTINUE;
     }
 
diff --git a/libbalsa/mailbox_local.c b/libbalsa/mailbox_local.c
index 0fa1e62c8..201aae3b1 100644
--- a/libbalsa/mailbox_local.c
+++ b/libbalsa/mailbox_local.c
@@ -1171,6 +1171,7 @@ lbml_set_threading_idle_cb(LibBalsaMailboxLocal *local)
         if (!priv->messages_loaded) {
             libbalsa_unlock_mailbox(mailbox);
 
+g_print("%s reschedules idle\n", __func__);
             return G_SOURCE_CONTINUE;
         }
 
diff --git a/src/balsa-index.c b/src/balsa-index.c
index fca4d30e3..dfdaf2c77 100644
--- a/src/balsa-index.c
+++ b/src/balsa-index.c
@@ -823,13 +823,16 @@ bndx_scroll_on_open_idle(BalsaIndex *bindex)
     mailbox = balsa_mailbox_node_get_mailbox(bindex->mailbox_node);
 
     if (!libbalsa_mailbox_get_messages_threaded(mailbox))
+{g_print("%s reschedules idle 1\n", __func__);
         return TRUE; /* G_SOURCE_CONTINUE */
+}
 
     if (balsa_app.expand_tree &&
         libbalsa_mailbox_get_threading_type(mailbox) != LB_MAILBOX_THREADING_FLAT &&
         !bindex->expanded) {
         gtk_tree_view_expand_all(tree_view);
         bindex->expanded = TRUE;
+g_print("%s reschedules idle 2\n", __func__);
         return TRUE; /* G_SOURCE_CONTINUE */
     }