LLoyd,
Are you sure that they are not firing? With the newer agents, it takes about 20 minutes for them to sho up in the DLP console. Also make sure you restarted the agent so it gets the new policies.
Is there an incident when it comes to any of the NEW Policies. - Regardless of a block or just a reporting of the violation.
The issue may be due to the NEW policy, can you provide the details or screenshots. If the policy is based on a new Data Identifier, then that could be the issue. I have seen it where the DI is badly written and stops detection.
Do you have the right policy group associated to the new policy so it works on the Endpoint Server?? Check your policy groups.
The more info on the policy the better...
Good luck!