I think the problem is in the use of g_markup_printf_escaped, this function
return a gchar* that you must free with g_free().
Probably you may take a look to ustring::compose functions.

Greetings
jamf.
-- 
Atentamente:
Juan Ángel Moreno Fernández
------------------------------
  Proyecto Gelide
  http://gelide.sf.net
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