"Invalid byte sequence" message

Hi again,

i upgraded im pg installation to 9.0.3 (from 8.4.2) and now i'm having trouble looking at my log files with pg admin
1.12.2.(on Mac OS 10.6) - on every refresh I'd get a messagebox saying: 

2011-02-15 14:28:12 ERROR  : ERROR:  invalid byte sequence for encoding "UTF8": 0xe3b66c

The server runs on Mac OS 10.6, the data is UTF8, and the client connection settings are as well.
Any pointers?

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