Context.pm creates a cache with Cache::Memcached while Koha::Cache uses Cache::Memcached::Fast. (And Context even uses a cache from Koha::Cache too!) While adding Cache::Memcached to PerlDependencies on the see also report, we should probably fix Context somehow to use Koha::Cache completely. Note that Fast does not support the parameters debug and expire_time as used in Context now.
It's on my todo list, but I'd like to see bug 16579 pushed first.
This has been done by Bug 11921: Restore memcached infos to koha-conf *** This bug has been marked as a duplicate of bug 11921 ***