Index: src/mainbox.c
===================================================================
--- src/mainbox.c	(revision 26659)
+++ src/mainbox.c	(working copy)
@@ -262,7 +262,9 @@
     /* orage_mark_appointments is rather heavy (=slow), so doing
      * it here is not a good idea. We can't keep up with the autorepeat
      * speed if we do the whole thing here. bug 2080 proofs it. so let's
-     * throw it to background and do it later */
+     * throw it to background and do it later. Just unmark days to avoid
+     * phantom-marks effects */
+    gtk_calendar_clear_marks(calendar);
     g_timeout_add(500, (GtkFunction)upd_calendar, calendar);
 }