What are the symptoms of 'not finding the latest method' ? What errors are thrown ?
How are you setting the WCF configuration ? By default, WCF references will be written to the app.config file, which is an issue with plugin deployment as you have to either put the data into an appropriate .config file for the process the plugin runs under,
and build the reference in code. So, one possibility is that the configuration data hasn't been deployed. Do you have an old copy of the web service in a different location ?
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