Memcache no expires not working!

Is CodeIgniter actually adding your data to memcache?
Have you used a 3rd party application to verify?
How much memory have you given memcache is it enough to hold everything you want to store so nothing is flushed?
I am using CodeIgniter memcache and it is working fine for me. Perhaps you are using a edge case?

This might also help: http://serverfault.com/questions/144971/...elete-keys

I am using CodeIgniter memcache and it's working fine except to 0 (never expire). I have some keys that delete every hour/day/15 days and it works perfectly fine.