Turns out this isn't a bug - I was just tripped up by the analysis changes to the example server.
Gary, you are probably just hitting the same thing. The "text" fieldType is no longer used by any fields by default - for example the "text" field uses the "text_general" fieldType. This fieldType uses the standard tokenizer, which discards stuff like commas (hence the synonym will never match). -Yonik http://www.lucidimagination.com