And of course after I ask the question, I find the solution… Apparently it’s caused by a trigger happy Mod_Security.
Adding these lines to the .htaccess file makes it go away nicely:
<IfModule mod_security.c>
SetEnvIfNoCase Request_URI ^/wp-admin/(?:post|async-upload)\.php$ MODSEC_ENABLE=Off
SetEnvIfNoCase Request_URI ^/xmlrpc\.php$ MODSEC_ENABLE=Off
SecFilterDebugLevel 0
SecFilterDefaultAction "deny,nolog,noauditlog,status:503"
</IfModule>
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