ANSWER:

Take a look into converting from FRS to DFS-R replication. Along the way you’ll probably figure out what’s going on and why things are taking so long, and move away from the now deprecated FRS sysvol replication.

Here’s the article from Microsoft outlining the process: http://technet.microsoft.com/en-us/library/dd640019(v=ws.10).aspx

In particular you can take note of the health checks at the beginning. This might also be a good time to repadmin and be sure that AD itself is resolving all SRV records properly and replicating as it should.

SpacemanSpiff from http://serverfault.com/questions/383868