> Some of the settings from shibboleth2.xml below. cleanupInterval is new in this
> version - have you had to change change to a higher/lower value?
> snippets from native_warn.log and shibd.log below. We can't figure out why
> Shib SP not redirecting to the IdP if it can't find the session.
You can't have told it to, basically. Whatever the issue is with memcache is beyond the scope of the software, the code is what it is and it isn't going to get any better, so if it doesn't work, don't use memcache.