Not sure if anyone else posted about this here, but I found the following post very helpful in resolving an issue where some of my hash rate was apparently being hijacked:

http://www.reddit.com/r/litecoinmining/comments/216ydt/psa_possible_miner_exploit/

After reviewing this post, and the discussing beneath it, I started using CGWatcher ( free download at the site linked below ) and now my hash rate displayed on the pool website ( ipoMiner in this case ) is more consistent and nearly matches the hash rate displayed in cgminer.

http://www.coinmyne.com/cgwatcher