Ned here (back from vacation, so don't worry - I'm getting to comments and emails as quickly as I can). If you are planning on doing a DFSR SYSVOL migration, please make sure you give the following KB's a thorough read before starting:

The first link has some straightforward workaround steps, the other two are actual hotfixes. Feel free to ask any questions you like on the first KB, I wrote it. :-)

- Ned 'SPF 70' Pyle