More info on this issue. Okay, found something else here:

remoteWorkerThread_1: copy from stdin on local node - PGRES_FATAL_ERROR 
ERROR:  invalid byte sequence for encoding "UTF8": 0xfa
HINT:  This error can also happen if the byte sequence does not match 
the encoding expected by the server, which is controlled by 
"client_encoding".
CONTEXT:  COPY avlds, line 339294

Is this a complaint because Slony expects one type of encoding and 
Postgresql is using a different one?  Or is it because of difference 
encoding between the two nodes?  As far as I can see, the encoding is 
the same on both nodes.

-- 
Until later, Geoffrey

Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety.
  - Benjamin Franklin