If you received a message saying that you are up-to-date on your weekly certifications, there are a couple of reasons why this has occurred:
You are certifying too early.
Make sure that you are waiting a full 7 days before you attempt to certify again.
Your "benefit year" has ended.
When you apply for unemployment benefits, you establish an active unemployment account for 52 weeks. This is referred to has a benefit year. When your benefit year ends and you still require unemployment assistance, your claim will stop and require you to file a new claim. To be approved for benefits in a new benefit year, you must have earned five times your weekly benefit amount.