UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0

Steps to reproduce the problem:
1. Block access policy setting is "*"
2. Whitelisted websites are not available (Blocked by policy)
3. 

What is the expected behavior?
Whitelisted websites being available

What went wrong?
GPO not working in current version. Other policy objects apply except whitelisted websites (the registry does have them)

Did this work before? Yes It worked until people updated this work week.

Chrome version: 60.0.3112.101  Channel: stable
OS Version: 10.0
Flash Version: