Vista media center thumbs on secondary hard disks? No GO?

I'm having a problem

I'm running x64 ultimate, and media center will not create thumbnails for
files stored on my RAID array.

I have a few video files stored on my primary C:\ drive, but i have a 2TB
raid array for storage (internal) that i keep most of my video files on, and
media center just shows generic icons for all of these files.

I've tried everything.

I have x64 codecs and x86 codecs installed (both media center and media
player are able to play all of my vidoes) but it still wont make thumbs.

Is there any way to turn on thumbnails on secondary hard drives?

I forgot to add, thumbnails DO appear for the video files stored on my C:\
drive.