We've recently added randomized testing for result grouping that
resulted in finding + fixing a number of bugs.
I've you've been using this feature, you should move to the latest
trunk version.

I've also added a section at the bottom of the wiki page to list
current limitations.
http://wiki.apache.org/solr/FieldCollapsing

-Yonik
http://www.lucidimagination.com

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