I recently updated one of my Wordpress blogs to v2.3
All seemed to be going well until I tried to post a new entry using Windows Live Writer (v12.0.1277.816) and it had an issue. Live Writer would post the entry yet come back with an error. It would not know it had posted the entry and would therefore save it as a draft. Also, republishing the same (draft) entry would result in an entirely new copy being published on the blog. The error was this:
Invalid Server Response
The response to the metaWeblog.editPost method received from the weblog server was invalid:
Invalid response document returned from XmlRpc server.
I hunted high and low for a solution. I did not find one. Then I thought perhaps there was an issue with my plugins. After disabling all plugins and then one-by-one reactivating them, I discovered the one causing the issue: Google Sitemaps v2.7.1
Looking up this plugin on the Wordpress 2.3 plugin compatibility list I see it is not compatible and that there is an updated version (3.0). I deleted the 2.7.1 version (just one file called sitemaps.php) and installed the folder and files for v3.0
After activating this new version I no longer get the publishing error on Windows Live Writer.
The lesson here is to check that all activated plugins are compatible with the latest version of Wordpress.
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