Hi Joseph,

You get a captcha error if you generate AuthTokens very frequently. 
AuthTokens issued by ClientLogin API are long lived, you should reuse them 
as much as possible. See this blog on AuthToken management for more 
details: 
http://adwordsapi.blogspot.com/2010/07/discover-v2009-working-with-authtokens.html

Cheers,
Anash P. Oommen,
AdWords API Advisor.

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