I'm using the XMLRPC plugin as well as the sitemap generator.
When using setPostCategories, I get back output from the sitemap generator plugin it seems prepended to the correct XML reply, but this makes the client (Net::MovableType Perl module used to post through XMLRPC) barf.
This simple fix corrects the problem:
--- serendipity_xmlrpc.inc.php.orig 2009-07-01 04:49:46.000000000 +0200...
2009-07-01 15:36:50 UTC in Serendipity PHP Weblog System
