Unknown or Unusable Identity Provider for Shib 3.2 SP

[shibboleth.vse4h at simplelogin.com]

We're having issues after upgrading the SAML (php) IdP to 2.0, although from everything I can tell, the Shib server is not even making a request to the IdP for metadata, just returns a 500 /auth/shibboleth/index.php. If we had a request to debug, this wold be easier, but I feel like we need to look for some sort of misconfiguration on the SP side of the equation.
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