After configuring 2 nodes as explained in the documentation the master (node 1) logs several SQL errors like:

24562:20130429:165953.158 NODE 1: Received configuration changes from slave node 2 for node 2 datalen 2773601
24562:20130429:165954.256 [Z3005] query failed: [0] PGRES_FATAL_ERROR:ERROR: syntax error at or near "1"
LINE 1427: ...00\\350\\235
345Tx p\\020\\354|\\353\\177\\247_\'1\\177
22...
^
and the configuration sync doesn't finish correctly (some data is visible while other, like templates, is not).