Struggling with forced_video_storage_path_prefix setting

[checkbin]

I have SageTV running on Arch Linux and its running great. However I'm trying to configure an R5000-HD server on a separate Windows box. I have the R5000 server configured with FreeNFS and an NFS shared directory that is mounted on the SageTV Linux box. It works well, both systems can see the share and read/write to it. The problem I'm having is using the forced_video_storage_path_prefix option to tell SageTV to record the R5000 recordings to only the NFS share and not the local drives. I added the forced_video_storage_path_prefix settings to Sage.properties but after I added the R5000 share to the Video Recording directories in Sage, SageTV sometimes records R5000 recordings to the NFS share and all is good, but it often still tries to record to the local recording directories, and of course fails.

Here's my entry for in the Sage.properties file:
mmc/encoders/12346/forced_video_storage_path_prefix=/mnt/R5000_Recordings

/mnt/R5000_Recordings is the mount point on the Linux server and the NFS share on the R5000 Windows box is C:\mnt\R5000_Recordings. I also tried using //mnt/R5000_Recordings and even ///mnt/R5000_Recordings but it fails to only record R5000 recordings only to this directory.

Can anyone tell me the exact entry I should use in Sage.properties to make this work? Thanks in advance for your assistance.