Hi Claudio,
  Another possibility is you may still be using a clientEmail header.  The 
clientEmail header is ignored in v201109 (use clientCustomerId instead), 
which means if you authenticate with an MCC and used to use clientEmail to 
target the client account, the request is now going directly against the 
MCC (clientEmail ignored, no clientCustomerId) which has no AdGroups or 
Campaigns as it is an MCC.

- Kevin Winter
AdWords API Team

On Wednesday, December 14, 2011 10:28:52 AM UTC-5, Carballal Claudio wrote:
>
> Hi,
>
> I'm using C# API for Adwords, updating from v201101 to v201109. Using 
> v201101, I get all the groups for a certain campaign without problems, but 
> when I use the v201109 for the same campaign I get always null in 
> page.entries. Using the example provided in v201109 I'm getting the same 
> behaviour, no errors, or exceptions or anything, just null in page.entries.
>
> Thanks,
>
> Claudio
>
>

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