bugs with flickr.groups.pools.getPhotos

Hello,

I am trying to write a wrapper for Flickr API for the SPIP template
engine. But I am having troubles with the pools.getPhotos method.

It gives unconsistent results.
For a query with:
group_id=38873539@N00
user_id=71651012@N00
I get:
<rsp stat="ok">
<photos page="1" pages="1" perpage="100" total="8"/>
</rsp>

There are 8 photos
(http://www.flickr.com/groups/38873539@N00/pool/71651012@N00), but the
xml result is empty. 

If I add the parameter 
tags=spselection
(that all the 8 photos have)
I get:
<rsp stat="ok">
<photos page="1" pages="0" perpage="100" total=""/>
</rsp>
(no value for total...)

If I "Sign call as mortimer? with full permissions?", I get the right
results:
<rsp stat="ok">
<photos page="1" pages="1" perpage="100" total="8">
<photo id="247335349" owner="71651012@N00" secret="c26c0528f8"
server="89" farm="1" title="Modern Angels" ispublic="1" isfriend="0"
isfamily="0" ownername="mortimer?" dateadded="1158660633"/>
<photo id="227122791" owner="71651012@N00" secret="3b6fa32f8a"
server="86" farm="1" title="Touched II" ispublic="1" isfriend="0"
isfamily="0" ownername="mortimer?" dateadded="1156770965"/>
<photo id="221051561" owner="71651012@N00" secret="1b74296091"
server="98" farm="1" title="Changing Pattern" ispublic="1"
isfriend="0" isfamily="0" ownername="mortimer?" dateadded="1156170536"/>
<photo id="172143335" owner="71651012@N00" secret="3226930beb"
server="51" farm="1" title="Popeye" ispublic="1" isfriend="0"
isfamily="0" ownername="mortimer?" dateadded="1150918668"/>
<photo id="158257143" owner="71651012@N00" secret="f1b49e127e"
server="47" farm="1" title="Les Carroz" ispublic="1" isfriend="0"
isfamily="0" ownername="mortimer?" dateadded="1149199720"/>
<photo id="139203563" owner="71651012@N00" secret="95a57489c9"
server="44" farm="1" title="This is not a teacup!" ispublic="1"
isfriend="0" isfamily="0" ownername="mortimer?" dateadded="1146592160"/>
<photo id="139073414" owner="71651012@N00" secret="06557f2b50"
server="49" farm="1" title="View over the Alps" ispublic="1"
isfriend="0" isfamily="0" ownername="mortimer?" dateadded="1146577565"/>
<photo id="127194972" owner="71651012@N00" secret="8e6cbc4b37"
server="1" farm="1" title="A "few" balloons" ispublic="1" isfriend="0"
isfamily="0" ownername="mortimer?" dateadded="1144799394"/>
</photos>
</rsp>

If I try with another user_id: 82142592@N00, without signing the call.
I get the right result directly.

Is there a bug on Flickr side?

Thank you.

Pierre

PS: what is the new farm attribute that appeared on the results from
calls returning info about a photo?
PPS: I noticed that the results returned by the getContext and
getAllContexts methods are not very consistent with the documentation: 
1- the method returns a <count>
2- the contexts are grouped by <set> and <pool>




 
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