I'm facing a problem with my installation I guess since it's happening with everything. within the administration panel and in the page itself.
apparently wordpress does this
the search also used to give the same result but I searched the forum and found an answer to replace PHP_SELF
but not with this.. I can't figure out what the problem is.. even within the Manage Posts in the administration panel I get the same error.. so I guess it's not the template.
The Blog Address and Blog Address in the Options is http://subdomain.domain.com
So I don't think the problem is there.. but probably in the WP-Admin link*.php files.