[PROBLEM] Samba not sharing external USB drive

[Deep6]

Hi there,

I'm having a problem with SMB and I'm having some trouble figuring it out. Here's the deal:

Software
XBian version: 1.0Beta2
XBMC version:12.2
Overclock settings: default

Hardware
Power supply rating: ?
RPi model (B 512mb):
SD card size and make/type: 8 GB (from Rpi)
Network (wireless or LAN): LAN
Connected devices (TV, USB, network storage, etc.): 2 USB Drives

Logile
Didn't see anything relevant in xbmc log

Problem description:

I have two USB drives connected to the RPi through a powered USB hub. Lets call them DiskA and DiskB. For some time, everything has been working fine. They both get automounted, and automatically shared with the auto share feature in Xbian. In my library, the source folders are set with the smb addresses because I have shared libraries with mysql.
Recently, for some reason XBMC could not find media files in diskB. I later noticed the diskB wasn't available in the previous smb address. Usually the shared addresses were:

//<rpiIpAddr>/DiskA
//<rpiIpAddr>/DiskB

Now the weird thing is, I have only one

//<rpiIpAddr>/DiskA
and within diskA I can find a folder called DiskB with everything from DiskB inside it. Like this

//<rpiIpAddr>/DiskA/DiskB


So, I turned the RPi off, Disconected DiskA and started it only with DiskB connected.
What happens is that It gets auto mounted but doesn't get shared. In log.smbd, I get a warning like
WARNING: No path in service DiskB - making it unavailable!

Since XBMC is looking for a network address that doesn't exist, it can't find any of my files...

So, any ideas how this happened, and how can I get arround it?

Thanks for your time.