See http://www.e-rewards.com/memberagreement.do

They must have changed their expiration policy.
Section 8) Expiration of e-Rewards Currency states:

"If Member's account has been inactive for twelve (12) months immediately preceding the end of the Membership Year, one-hundred percent (100%) of any unused e-Rewards Currency remaining in the a Member's account that was earned during the just-ended Membership Year will expire, and will be removed from the Member's account.

At e-Rewards' sole discretion, e-Rewards may choose to waive or defer enforcement of the expiration of a Member's e-Rewards Currency."