The Directory Connector UNLS never completes or isn't working.

You'll need to make sure Domain Controller has the following settings:

ComputerConf > Policies > Admin Templates > System > Scripts
- "Run logon scripts synchronously" = disabled
- "Run startup scripts asynchronously" = enabled

UserConf > Policies > Admin Templates > System > Scripts
- "Run logon scripts synchronously" = disabled

One user solved his issue by adding the UNLS here:

UserConf > Policies > Administrative Templates > System > Logon > Run These Programs at System Logon