Well this error recently happened today and infuriatingly prevented uploading images. According to this guys explanation its the old chestnut of the development teams not talking to eachother meaning that a database schema was changed that affected a part of code which now broke because of it.
Anyway, the fix is;
ALTER TABLE wp_posts CHANGE post_parent post_parent BIGINT;
And his full post is at;
http://ardentdev.com/fix-for-wordpress-xmlrpc-500-internal-server-error/
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